71513613545 has 32 divisors (see below), whose sum is σ = 94116484224. Its totient is φ = 51733440000.

The previous prime is 71513613541. The next prime is 71513613547. The reversal of 71513613545 is 54531631517.

It is not a de Polignac number, because 71513613545 - 2² = 71513613541 is a prime.

It is a super-2 number, since 2×71513613545² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71513613541) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11772629 + ... + 11778701.

It is an arithmetic number, because the mean of its divisors is an integer number (2941140132).

Almost surely, 2^71513613545 is an apocalyptic number.

It is an amenable number.

71513613545 is a deficient number, since it is larger than the sum of its proper divisors (22602870679).

71513613545 is a wasteful number, since it uses less digits than its factorization.

71513613545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7193.

The product of its digits is 189000, while the sum is 41.

The spelling of 71513613545 in words is "seventy-one billion, five hundred thirteen million, six hundred thirteen thousand, five hundred forty-five".