634711512857 has 2 divisors, whose sum is σ = 634711512858. Its totient is φ = 634711512856.

The previous prime is 634711512833. The next prime is 634711512871. The reversal of 634711512857 is 758215117436.

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., 436565454361 + 198146058496 = 660731^2 + 445136^2 .

It is a cyclic number.

It is not a de Polignac number, because 634711512857 - 2¹⁴ = 634711496473 is a prime.

It is not a weakly prime, because it can be changed into another prime (634711512817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317355756428 + 317355756429.

It is an arithmetic number, because the mean of its divisors is an integer number (317355756429).

Almost surely, 2^634711512857 is an apocalyptic number.

It is an amenable number.

634711512857 is a deficient number, since it is larger than the sum of its proper divisors (1).

634711512857 is an equidigital number, since it uses as much as digits as its factorization.

634711512857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1411200, while the sum is 50.

The spelling of 634711512857 in words is "six hundred thirty-four billion, seven hundred eleven million, five hundred twelve thousand, eight hundred fifty-seven".