648954161640 has 128 divisors (see below), whose sum is σ = 2163898252800. Its totient is φ = 172997026560.

The previous prime is 648954161617. The next prime is 648954161663. The reversal of 648954161640 is 46161459846.

648954161640 is a `hidden beast` number, since 6 + 4 + 89 + 541 + 6 + 16 + 4 + 0 = 666.

648954161640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (648954161617) and next prime (648954161663).

It is a super-2 number, since 2×648954161640² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3207729 + ... + 3404031.

It is an arithmetic number, because the mean of its divisors is an integer number (16905455100).

Almost surely, 2^648954161640 is an apocalyptic number.

648954161640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 648954161640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1081949126400).

648954161640 is an abundant number, since it is smaller than the sum of its proper divisors (1514944091160).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

648954161640 is a wasteful number, since it uses less digits than its factorization.

648954161640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199384 (or 199374 counting only the distinct ones).

The product of its (nonzero) digits is 4976640, while the sum is 54.

The spelling of 648954161640 in words is "six hundred forty-eight billion, nine hundred fifty-four million, one hundred sixty-one thousand, six hundred forty".