156420956891 has 2 divisors, whose sum is σ = 156420956892. Its totient is φ = 156420956890.

The previous prime is 156420956843. The next prime is 156420956897. The reversal of 156420956891 is 198659024651.

It is a strong prime.

It is an emirp because it is prime and its reverse (198659024651) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 156420956891 - 2²² = 156416762587 is a prime.

It is not a weakly prime, because it can be changed into another prime (156420956897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78210478445 + 78210478446.

It is an arithmetic number, because the mean of its divisors is an integer number (78210478446).

Almost surely, 2^156420956891 is an apocalyptic number.

156420956891 is a deficient number, since it is larger than the sum of its proper divisors (1).

156420956891 is an equidigital number, since it uses as much as digits as its factorization.

156420956891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4665600, while the sum is 56.

The spelling of 156420956891 in words is "one hundred fifty-six billion, four hundred twenty million, nine hundred fifty-six thousand, eight hundred ninety-one".