163886656640 has 64 divisors (see below), whose sum is σ = 447761770560. Its totient is φ = 56189709312.

The previous prime is 163886656631. The next prime is 163886656651. The reversal of 163886656640 is 46656688361.

It is a tau number, because it is divible by the number of its divisors (64).

It is a self number, because there is not a number n which added to its sum of digits gives 163886656640.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18286442 + ... + 18295401.

It is an arithmetic number, because the mean of its divisors is an integer number (6996277665).

Almost surely, 2^163886656640 is an apocalyptic number.

163886656640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

163886656640 is an abundant number, since it is smaller than the sum of its proper divisors (283875113920).

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

163886656640 is an equidigital number, since it uses as much as digits as its factorization.

163886656640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36581869 (or 36581857 counting only the distinct ones).

The product of its (nonzero) digits is 29859840, while the sum is 59.

The spelling of 163886656640 in words is "one hundred sixty-three billion, eight hundred eighty-six million, six hundred fifty-six thousand, six hundred forty".