71999977532545 has 32 divisors (see below), whose sum is σ = 87085041563520. Its totient is φ = 57144809226240.

The previous prime is 71999977532507. The next prime is 71999977532627. The reversal of 71999977532545 is 54523577999917.

It is not a de Polignac number, because 71999977532545 - 2²⁹ = 71999440661633 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3906027649 + ... + 3906046081.

It is an arithmetic number, because the mean of its divisors is an integer number (2721407548860).

Almost surely, 2^{71999977532545} is an apocalyptic number.

It is an amenable number.

71999977532545 is a deficient number, since it is larger than the sum of its proper divisors (15085064030975).

71999977532545 is a wasteful number, since it uses less digits than its factorization.

71999977532545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28545.

The product of its digits is 6751269000, while the sum is 82.

The spelling of 71999977532545 in words is "seventy-one trillion, nine hundred ninety-nine billion, nine hundred seventy-seven million, five hundred thirty-two thousand, five hundred forty-five".