634121309957 has 2 divisors, whose sum is σ = 634121309958. Its totient is φ = 634121309956.

The previous prime is 634121309917. The next prime is 634121310013. The reversal of 634121309957 is 759903121436.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 366362667841 + 267758642116 = 605279^2 + 517454^2 .

It is a cyclic number.

It is not a de Polignac number, because 634121309957 - 2⁶ = 634121309893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (634121309917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317060654978 + 317060654979.

It is an arithmetic number, because the mean of its divisors is an integer number (317060654979).

Almost surely, 2^634121309957 is an apocalyptic number.

It is an amenable number.

634121309957 is a deficient number, since it is larger than the sum of its proper divisors (1).

634121309957 is an equidigital number, since it uses as much as digits as its factorization.

634121309957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1224720, while the sum is 50.

The spelling of 634121309957 in words is "six hundred thirty-four billion, one hundred twenty-one million, three hundred nine thousand, nine hundred fifty-seven".