78900156931 has 2 divisors, whose sum is σ = 78900156932. Its totient is φ = 78900156930.

The previous prime is 78900156893. The next prime is 78900156947. The reversal of 78900156931 is 13965100987.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78900156931 - 2¹³ = 78900148739 is a prime.

It is a super-2 number, since 2×78900156931² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78900156991) 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 as a sum of consecutive naturals, namely, 39450078465 + 39450078466.

It is an arithmetic number, because the mean of its divisors is an integer number (39450078466).

Almost surely, 2^78900156931 is an apocalyptic number.

78900156931 is a deficient number, since it is larger than the sum of its proper divisors (1).

78900156931 is an equidigital number, since it uses as much as digits as its factorization.

78900156931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 408240, while the sum is 49.

The spelling of 78900156931 in words is "seventy-eight billion, nine hundred million, one hundred fifty-six thousand, nine hundred thirty-one".