156563978 has 4 divisors (see below), whose sum is σ = 234845970. Its totient is φ = 78281988.

The previous prime is 156563951. The next prime is 156563987. The reversal of 156563978 is 879365651.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 87291649 + 69272329 = 9343^2 + 8323^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 39140993 + ... + 39140996.

Almost surely, 2^156563978 is an apocalyptic number.

156563978 is a deficient number, since it is larger than the sum of its proper divisors (78281992).

156563978 is an equidigital number, since it uses as much as digits as its factorization.

156563978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78281991.

The product of its digits is 1360800, while the sum is 50.

The square root of 156563978 is about 12512.5528170713. The cubic root of 156563978 is about 538.9692018434.

The spelling of 156563978 in words is "one hundred fifty-six million, five hundred sixty-three thousand, nine hundred seventy-eight".