634757579851 has 2 divisors, whose sum is σ = 634757579852. Its totient is φ = 634757579850.

The previous prime is 634757579837. The next prime is 634757579921. The reversal of 634757579851 is 158975757436.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-634757579851 is a prime.

It is not a weakly prime, because it can be changed into another prime (634757579821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317378789925 + 317378789926.

It is an arithmetic number, because the mean of its divisors is an integer number (317378789926).

Almost surely, 2^634757579851 is an apocalyptic number.

634757579851 is a deficient number, since it is larger than the sum of its proper divisors (1).

634757579851 is an equidigital number, since it uses as much as digits as its factorization.

634757579851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 222264000, while the sum is 67.

The spelling of 634757579851 in words is "six hundred thirty-four billion, seven hundred fifty-seven million, five hundred seventy-nine thousand, eight hundred fifty-one".