161657836698413 has 8 divisors (see below), whose sum is σ = 177124108493280. Its totient is φ = 146319915707280.

The previous prime is 161657836698367. The next prime is 161657836698433. The reversal of 161657836698413 is 314896638756161.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161657836698413 - 2²² = 161657832504109 is a prime.

It is a super-2 number, since 2×161657836698413² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161657836698433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32087698295 + ... + 32087703332.

It is an arithmetic number, because the mean of its divisors is an integer number (22140513561660).

Almost surely, 2^{161657836698413} is an apocalyptic number.

It is an amenable number.

161657836698413 is a deficient number, since it is larger than the sum of its proper divisors (15466271794867).

161657836698413 is a wasteful number, since it uses less digits than its factorization.

161657836698413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64175401867.

The product of its digits is 940584960, while the sum is 74.

The spelling of 161657836698413 in words is "one hundred sixty-one trillion, six hundred fifty-seven billion, eight hundred thirty-six million, six hundred ninety-eight thousand, four hundred thirteen".