156439900385 has 4 divisors (see below), whose sum is σ = 187727880468. Its totient is φ = 125151920304.

The previous prime is 156439900363. The next prime is 156439900427. The reversal of 156439900385 is 583009934651.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 583009934651 = 167 ⋅3491077453.

It can be written as a sum of positive squares in 2 ways, for example, as 32870777809 + 123569122576 = 181303^2 + 351524^2 .

It is a cyclic number.

It is not a de Polignac number, because 156439900385 - 2²⁰ = 156438851809 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15643990034 + ... + 15643990043.

It is an arithmetic number, because the mean of its divisors is an integer number (46931970117).

Almost surely, 2^156439900385 is an apocalyptic number.

It is an amenable number.

156439900385 is a deficient number, since it is larger than the sum of its proper divisors (31287980083).

156439900385 is an equidigital number, since it uses as much as digits as its factorization.

156439900385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31287980082.

The product of its (nonzero) digits is 3499200, while the sum is 53.

The spelling of 156439900385 in words is "one hundred fifty-six billion, four hundred thirty-nine million, nine hundred thousand, three hundred eighty-five".