71397384665 has 16 divisors (see below), whose sum is σ = 88064329680. Its totient is φ = 55528784640.

The previous prime is 71397384659. The next prime is 71397384679. The reversal of 71397384665 is 56648379317.

It can be written as a sum of positive squares in 8 ways, for example, as 14184571801 + 57212812864 = 119099^2 + 239192^2 .

It is not a de Polignac number, because 71397384665 - 2²⁶ = 71330275801 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70355 + ... + 384375.

It is an arithmetic number, because the mean of its divisors is an integer number (5504020605).

Almost surely, 2^71397384665 is an apocalyptic number.

It is an amenable number.

71397384665 is a deficient number, since it is larger than the sum of its proper divisors (16666945015).

71397384665 is a wasteful number, since it uses less digits than its factorization.

71397384665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315292.

The product of its digits is 22861440, while the sum is 59.

The spelling of 71397384665 in words is "seventy-one billion, three hundred ninety-seven million, three hundred eighty-four thousand, six hundred sixty-five".