808400272957 has 2 divisors, whose sum is σ = 808400272958. Its totient is φ = 808400272956.

The previous prime is 808400272879. The next prime is 808400272993. The reversal of 808400272957 is 759272004808.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 742666491961 + 65733780996 = 861781^2 + 256386^2 .

It is a cyclic number.

It is not a de Polignac number, because 808400272957 - 2²⁷ = 808266055229 is a prime.

It is a super-2 number, since 2×808400272957² (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 (808400272997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 404200136478 + 404200136479.

It is an arithmetic number, because the mean of its divisors is an integer number (404200136479).

Almost surely, 2^808400272957 is an apocalyptic number.

It is an amenable number.

808400272957 is a deficient number, since it is larger than the sum of its proper divisors (1).

808400272957 is an equidigital number, since it uses as much as digits as its factorization.

808400272957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2257920, while the sum is 52.

The spelling of 808400272957 in words is "eight hundred eight billion, four hundred million, two hundred seventy-two thousand, nine hundred fifty-seven".