71512997407 has 2 divisors, whose sum is σ = 71512997408. Its totient is φ = 71512997406.

The previous prime is 71512997399. The next prime is 71512997471. The reversal of 71512997407 is 70479921517.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 71512997407 - 2³ = 71512997399 is a prime.

It is a super-2 number, since 2×71512997407² (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 (71512997207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35756498703 + 35756498704.

It is an arithmetic number, because the mean of its divisors is an integer number (35756498704).

Almost surely, 2^71512997407 is an apocalyptic number.

71512997407 is a deficient number, since it is larger than the sum of its proper divisors (1).

71512997407 is an equidigital number, since it uses as much as digits as its factorization.

71512997407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1111320, while the sum is 52.

The spelling of 71512997407 in words is "seventy-one billion, five hundred twelve million, nine hundred ninety-seven thousand, four hundred seven".