856724804951 has 2 divisors, whose sum is σ = 856724804952. Its totient is φ = 856724804950.

The previous prime is 856724804927. The next prime is 856724804993. The reversal of 856724804951 is 159408427658.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-856724804951 is a prime.

It is a super-2 number, since 2×856724804951² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (856724801951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428362402475 + 428362402476.

It is an arithmetic number, because the mean of its divisors is an integer number (428362402476).

Almost surely, 2^856724804951 is an apocalyptic number.

856724804951 is a deficient number, since it is larger than the sum of its proper divisors (1).

856724804951 is an equidigital number, since it uses as much as digits as its factorization.

856724804951 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19353600, while the sum is 59.

The spelling of 856724804951 in words is "eight hundred fifty-six billion, seven hundred twenty-four million, eight hundred four thousand, nine hundred fifty-one".