161650931398656 has 384 divisors, whose sum is σ = 548950094784000. Its totient is φ = 41181304061952.

The previous prime is 161650931398603. The next prime is 161650931398729. The reversal of 161650931398656 is 656893139056161.

It is a tau number, because it is divible by the number of its divisors (384).

It is a super-2 number, since 2×161650931398656² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8073280 + ... + 19709888.

It is an arithmetic number, because the mean of its divisors is an integer number (1429557538500).

Almost surely, 2^{161650931398656} is an apocalyptic number.

161650931398656 is a gapful number since it is divisible by the number (16) 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 161650931398656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (274475047392000).

161650931398656 is an abundant number, since it is smaller than the sum of its proper divisors (387299163385344).

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

161650931398656 is a wasteful number, since it uses less digits than its factorization.

161650931398656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11636677 (or 11636657 counting only the distinct ones).

The product of its (nonzero) digits is 188956800, while the sum is 69.

The spelling of 161650931398656 in words is "one hundred sixty-one trillion, six hundred fifty billion, nine hundred thirty-one million, three hundred ninety-eight thousand, six hundred fifty-six".