156997786679959 has 2 divisors, whose sum is σ = 156997786679960. Its totient is φ = 156997786679958.

The previous prime is 156997786679873. The next prime is 156997786680019. The reversal of 156997786679959 is 959976687799651.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-156997786679959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (156997786679159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78498893339979 + 78498893339980.

It is an arithmetic number, because the mean of its divisors is an integer number (78498893339980).

Almost surely, 2^{156997786679959} is an apocalyptic number.

156997786679959 is a deficient number, since it is larger than the sum of its proper divisors (1).

156997786679959 is an equidigital number, since it uses as much as digits as its factorization.

156997786679959 is an evil number, because the sum of its binary digits is even.

The product of its digits is 874964462400, while the sum is 103.

The spelling of 156997786679959 in words is "one hundred fifty-six trillion, nine hundred ninety-seven billion, seven hundred eighty-six million, six hundred seventy-nine thousand, nine hundred fifty-nine".