156978163 has 4 divisors (see below), whose sum is σ = 157918320. Its totient is φ = 156038008.

The previous prime is 156978137. The next prime is 156978181. The reversal of 156978163 is 361879651.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-156978163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (156978113) by changing a digit.

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, 469828 + ... + 470161.

It is an arithmetic number, because the mean of its divisors is an integer number (39479580).

Almost surely, 2^156978163 is an apocalyptic number.

156978163 is a deficient number, since it is larger than the sum of its proper divisors (940157).

156978163 is an equidigital number, since it uses as much as digits as its factorization.

156978163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 940156.

The product of its digits is 272160, while the sum is 46.

The square root of 156978163 is about 12529.0926646745. The cubic root of 156978163 is about 539.4440586158. Note that the first 3 decimals are identical.

The spelling of 156978163 in words is "one hundred fifty-six million, nine hundred seventy-eight thousand, one hundred sixty-three".