156850849921 has 2 divisors, whose sum is σ = 156850849922. Its totient is φ = 156850849920.

The previous prime is 156850849919. The next prime is 156850849937. The reversal of 156850849921 is 129948058651.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 156550000896 + 300849025 = 395664^2 + 17345^2 .

It is a cyclic number.

It is not a de Polignac number, because 156850849921 - 2¹ = 156850849919 is a prime.

Together with 156850849919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (156850846921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78425424960 + 78425424961.

It is an arithmetic number, because the mean of its divisors is an integer number (78425424961).

Almost surely, 2^156850849921 is an apocalyptic number.

It is an amenable number.

156850849921 is a deficient number, since it is larger than the sum of its proper divisors (1).

156850849921 is an equidigital number, since it uses as much as digits as its factorization.

156850849921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6220800, while the sum is 58.

The spelling of 156850849921 in words is "one hundred fifty-six billion, eight hundred fifty million, eight hundred forty-nine thousand, nine hundred twenty-one".