156213166561 has 16 divisors (see below), whose sum is σ = 167075322624. Its totient is φ = 145723973824.

The previous prime is 156213166547. The next prime is 156213166597. The reversal of 156213166561 is 165661312651.

It is a cyclic number.

It is not a de Polignac number, because 156213166561 - 2¹³ = 156213158369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (156213166661) 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, 180106 + ... + 587251.

It is an arithmetic number, because the mean of its divisors is an integer number (10442207664).

Almost surely, 2^156213166561 is an apocalyptic number.

It is an amenable number.

156213166561 is a deficient number, since it is larger than the sum of its proper divisors (10862156063).

156213166561 is a wasteful number, since it uses less digits than its factorization.

156213166561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 767600.

The product of its digits is 194400, while the sum is 43.

The spelling of 156213166561 in words is "one hundred fifty-six billion, two hundred thirteen million, one hundred sixty-six thousand, five hundred sixty-one".