856457419957 has 2 divisors, whose sum is σ = 856457419958. Its totient is φ = 856457419956.

The previous prime is 856457419943. The next prime is 856457419991. The reversal of 856457419957 is 759914754658.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 582976533841 + 273480886116 = 763529^2 + 522954^2 .

It is a cyclic number.

It is not a de Polignac number, because 856457419957 - 2²³ = 856449031349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (856457419907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428228709978 + 428228709979.

It is an arithmetic number, because the mean of its divisors is an integer number (428228709979).

Almost surely, 2^856457419957 is an apocalyptic number.

It is an amenable number.

856457419957 is a deficient number, since it is larger than the sum of its proper divisors (1).

856457419957 is an equidigital number, since it uses as much as digits as its factorization.

856457419957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 381024000, while the sum is 70.

The spelling of 856457419957 in words is "eight hundred fifty-six billion, four hundred fifty-seven million, four hundred nineteen thousand, nine hundred fifty-seven".