71272515771 has 6 divisors (see below), whose sum is σ = 102949189460. Its totient is φ = 47515010508.

The previous prime is 71272515767. The next prime is 71272515841. The reversal of 71272515771 is 17751527217.

71272515771 is a `hidden beast` number, since 7 + 1 + 2 + 72 + 5 + 1 + 577 + 1 = 666.

It is not a de Polignac number, because 71272515771 - 2² = 71272515767 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71272515701) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3959584201 + ... + 3959584218.

Almost surely, 2^71272515771 is an apocalyptic number.

71272515771 is a deficient number, since it is larger than the sum of its proper divisors (31676673689).

71272515771 is a wasteful number, since it uses less digits than its factorization.

71272515771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7919168425 (or 7919168422 counting only the distinct ones).

The product of its digits is 240100, while the sum is 45.

The spelling of 71272515771 in words is "seventy-one billion, two hundred seventy-two million, five hundred fifteen thousand, seven hundred seventy-one".