126404564657 has 6 divisors (see below), whose sum is σ = 147042044658. Its totient is φ = 108346769664.

The previous prime is 126404564641. The next prime is 126404564669. The reversal of 126404564657 is 756465404621.

It can be written as a sum of positive squares in only one way, i.e., 122833426576 + 3571138081 = 350476^2 + 59759^2 .

It is not a de Polignac number, because 126404564657 - 2⁴ = 126404564641 is a prime.

It is a super-2 number, since 2×126404564657² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126404564617) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1289842448 + ... + 1289842545.

It is an arithmetic number, because the mean of its divisors is an integer number (24507007443).

Almost surely, 2^126404564657 is an apocalyptic number.

It is an amenable number.

126404564657 is a deficient number, since it is larger than the sum of its proper divisors (20637480001).

126404564657 is an equidigital number, since it uses as much as digits as its factorization.

126404564657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2579685007 (or 2579685000 counting only the distinct ones).

The product of its (nonzero) digits is 4838400, while the sum is 50.

The spelling of 126404564657 in words is "one hundred twenty-six billion, four hundred four million, five hundred sixty-four thousand, six hundred fifty-seven".