71512997377 has 2 divisors, whose sum is σ = 71512997378. Its totient is φ = 71512997376.

The previous prime is 71512997363. The next prime is 71512997399. The reversal of 71512997377 is 77379921517.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68227529616 + 3285467761 = 261204^2 + 57319^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71512997377 is a prime.

It is a super-2 number, since 2×71512997377² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (71512997357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35756498688 + 35756498689.

It is an arithmetic number, because the mean of its divisors is an integer number (35756498689).

Almost surely, 2^71512997377 is an apocalyptic number.

It is an amenable number.

71512997377 is a deficient number, since it is larger than the sum of its proper divisors (1).

71512997377 is an equidigital number, since it uses as much as digits as its factorization.

71512997377 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5834430, while the sum is 58.

The spelling of 71512997377 in words is "seventy-one billion, five hundred twelve million, nine hundred ninety-seven thousand, three hundred seventy-seven".