1650563640 has 192 divisors, whose sum is σ = 5913704160. Its totient is φ = 395919360.

The previous prime is 1650563561. The next prime is 1650563657. The reversal of 1650563640 is 463650561.

1650563640 is a `hidden beast` number, since 1 + 6 + 5 + 0 + 5 + 6 + 3 + 640 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1650563595 and 1650563604.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 381972 + ... + 386268.

Almost surely, 2^1650563640 is an apocalyptic number.

1650563640 is a gapful number since it is divisible by the number (10) 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 1650563640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2956852080).

1650563640 is an abundant number, since it is smaller than the sum of its proper divisors (4263140520).

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

1650563640 is a wasteful number, since it uses less digits than its factorization.

1650563640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4422 (or 4415 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The square root of 1650563640 is about 40627.1293595794. The cubic root of 1650563640 is about 1181.8002874895.

The spelling of 1650563640 in words is "one billion, six hundred fifty million, five hundred sixty-three thousand, six hundred forty".