156661156013 has 2 divisors, whose sum is σ = 156661156014. Its totient is φ = 156661156012.

The previous prime is 156661155913. The next prime is 156661156021. The reversal of 156661156013 is 310651166651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 151042604164 + 5618551849 = 388642^2 + 74957^2 .

It is a cyclic number.

It is not a de Polignac number, because 156661156013 - 2¹⁰ = 156661154989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (156661156213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78330578006 + 78330578007.

It is an arithmetic number, because the mean of its divisors is an integer number (78330578007).

Almost surely, 2^156661156013 is an apocalyptic number.

It is an amenable number.

156661156013 is a deficient number, since it is larger than the sum of its proper divisors (1).

156661156013 is an equidigital number, since it uses as much as digits as its factorization.

156661156013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 97200, while the sum is 41.

The spelling of 156661156013 in words is "one hundred fifty-six billion, six hundred sixty-one million, one hundred fifty-six thousand, thirteen".