156959449897 has 2 divisors, whose sum is σ = 156959449898. Its totient is φ = 156959449896.

The previous prime is 156959449853. The next prime is 156959449921. The reversal of 156959449897 is 798944959651.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 88386695401 + 68572754496 = 297299^2 + 261864^2 .

It is a cyclic number.

It is not a de Polignac number, because 156959449897 - 2³¹ = 154811966249 is a prime.

It is not a weakly prime, because it can be changed into another prime (156959449807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78479724948 + 78479724949.

It is an arithmetic number, because the mean of its divisors is an integer number (78479724949).

Almost surely, 2^156959449897 is an apocalyptic number.

It is an amenable number.

156959449897 is a deficient number, since it is larger than the sum of its proper divisors (1).

156959449897 is an equidigital number, since it uses as much as digits as its factorization.

156959449897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 881798400, while the sum is 76.

The spelling of 156959449897 in words is "one hundred fifty-six billion, nine hundred fifty-nine million, four hundred forty-nine thousand, eight hundred ninety-seven".