156738561 has 16 divisors (see below), whose sum is σ = 243922944. Its totient is φ = 87658704.

The previous prime is 156738553. The next prime is 156738587. The reversal of 156738561 is 165837651.

It is not a de Polignac number, because 156738561 - 2³ = 156738553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (156738551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78415 + ... + 80388.

It is an arithmetic number, because the mean of its divisors is an integer number (15245184).

Almost surely, 2^156738561 is an apocalyptic number.

It is an amenable number.

156738561 is a deficient number, since it is larger than the sum of its proper divisors (87184383).

156738561 is a wasteful number, since it uses less digits than its factorization.

156738561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158860.

The product of its digits is 151200, while the sum is 42.

The square root of 156738561 is about 12519.5271875578. The cubic root of 156738561 is about 539.1694605667.

The spelling of 156738561 in words is "one hundred fifty-six million, seven hundred thirty-eight thousand, five hundred sixty-one".