74712865517 has 2 divisors, whose sum is σ = 74712865518. Its totient is φ = 74712865516.

The previous prime is 74712865489. The next prime is 74712865529. The reversal of 74712865517 is 71556821747.

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., 64757016676 + 9955848841 = 254474^2 + 99779^2 .

It is a cyclic number.

It is not a de Polignac number, because 74712865517 - 2²⁴ = 74696088301 is a prime.

It is a super-2 number, since 2×74712865517² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74712865567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37356432758 + 37356432759.

It is an arithmetic number, because the mean of its divisors is an integer number (37356432759).

Almost surely, 2^74712865517 is an apocalyptic number.

It is an amenable number.

74712865517 is a deficient number, since it is larger than the sum of its proper divisors (1).

74712865517 is an equidigital number, since it uses as much as digits as its factorization.

74712865517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3292800, while the sum is 53.

The spelling of 74712865517 in words is "seventy-four billion, seven hundred twelve million, eight hundred sixty-five thousand, five hundred seventeen".