156840330561 has 32 divisors (see below), whose sum is σ = 224172357888. Its totient is φ = 97284084480.

The previous prime is 156840330539. The next prime is 156840330589. The reversal of 156840330561 is 165033048651.

It is not a de Polignac number, because 156840330561 - 2¹⁴ = 156840314177 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (156840331561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13262031 + ... + 13273851.

It is an arithmetic number, because the mean of its divisors is an integer number (7005386184).

Almost surely, 2^156840330561 is an apocalyptic number.

It is an amenable number.

156840330561 is a deficient number, since it is larger than the sum of its proper divisors (67332027327).

156840330561 is a wasteful number, since it uses less digits than its factorization.

156840330561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17081.

The product of its (nonzero) digits is 259200, while the sum is 42.

The spelling of 156840330561 in words is "one hundred fifty-six billion, eight hundred forty million, three hundred thirty thousand, five hundred sixty-one".