856373502161 has 2 divisors, whose sum is σ = 856373502162. Its totient is φ = 856373502160.

The previous prime is 856373502157. The next prime is 856373502263. The reversal of 856373502161 is 161205373658.

856373502161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 673975321600 + 182398180561 = 820960^2 + 427081^2 .

It is a cyclic number.

It is not a de Polignac number, because 856373502161 - 2² = 856373502157 is a prime.

It is not a weakly prime, because it can be changed into another prime (856373502461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428186751080 + 428186751081.

It is an arithmetic number, because the mean of its divisors is an integer number (428186751081).

Almost surely, 2^856373502161 is an apocalyptic number.

It is an amenable number.

856373502161 is a deficient number, since it is larger than the sum of its proper divisors (1).

856373502161 is an equidigital number, since it uses as much as digits as its factorization.

856373502161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 907200, while the sum is 47.

The spelling of 856373502161 in words is "eight hundred fifty-six billion, three hundred seventy-three million, five hundred two thousand, one hundred sixty-one".