161257688223 has 16 divisors (see below), whose sum is σ = 219497545440. Its totient is φ = 105269450624.

The previous prime is 161257688213. The next prime is 161257688243. The reversal of 161257688223 is 322886752161.

It is a cyclic number.

It is not a de Polignac number, because 161257688223 - 2⁵ = 161257688191 is a prime.

It is a super-2 number, since 2×161257688223² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161257688203) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 915336 + ... + 1077197.

It is an arithmetic number, because the mean of its divisors is an integer number (13718596590).

Almost surely, 2^161257688223 is an apocalyptic number.

161257688223 is a deficient number, since it is larger than the sum of its proper divisors (58239857217).

161257688223 is a wasteful number, since it uses less digits than its factorization.

161257688223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1993098.

The product of its digits is 1935360, while the sum is 51.

The spelling of 161257688223 in words is "one hundred sixty-one billion, two hundred fifty-seven million, six hundred eighty-eight thousand, two hundred twenty-three".