163487264640 has 1024 divisors, whose sum is σ = 658252707840. Its totient is φ = 33662435328.

The previous prime is 163487264639. The next prime is 163487264651. The reversal of 163487264640 is 46462784361.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 701661964 + ... + 701662196.

It is an arithmetic number, because the mean of its divisors is an integer number (642824910).

Almost surely, 2^163487264640 is an apocalyptic number.

163487264640 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 163487264640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (329126353920).

163487264640 is an abundant number, since it is smaller than the sum of its proper divisors (494765443200).

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

163487264640 is a wasteful number, since it uses less digits than its factorization.

163487264640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399 (or 387 counting only the distinct ones).

The product of its (nonzero) digits is 4644864, while the sum is 51.

The spelling of 163487264640 in words is "one hundred sixty-three billion, four hundred eighty-seven million, two hundred sixty-four thousand, six hundred forty".