161657068356 has 135 divisors (see below), whose sum is σ = 491754106767. Its totient is φ = 46173259440.

The previous prime is 161657068259. The next prime is 161657068357. The reversal of 161657068356 is 653860756161.

The square root of 161657068356 is 402066.

It is a perfect power (a square), and thus also a powerful number.

161657068356 is a `hidden beast` number, since 1 + 6 + 1 + 6 + 570 + 68 + 3 + 5 + 6 = 666.

It is a super-2 number, since 2×161657068356² (a number of 23 digits) contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (161657068357) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 50658721 + ... + 50661911.

Almost surely, 2^161657068356 is an apocalyptic number.

161657068356 is the 402066-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161657068356

161657068356 is an abundant number, since it is smaller than the sum of its proper divisors (330097038411).

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

161657068356 is an frugal number, since it uses more digits than its factorization.

161657068356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6412 (or 3203 counting only the distinct ones).

The product of its (nonzero) digits is 5443200, while the sum is 54.

The spelling of 161657068356 in words is "one hundred sixty-one billion, six hundred fifty-seven million, sixty-eight thousand, three hundred fifty-six".