71323665513 has 4 divisors (see below), whose sum is σ = 95098220688. Its totient is φ = 47549110340.

The previous prime is 71323665467. The next prime is 71323665541. The reversal of 71323665513 is 31556632317.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71323665513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71323665593) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11887277583 + ... + 11887277588.

It is an arithmetic number, because the mean of its divisors is an integer number (23774555172).

Almost surely, 2^71323665513 is an apocalyptic number.

It is an amenable number.

71323665513 is a deficient number, since it is larger than the sum of its proper divisors (23774555175).

71323665513 is a wasteful number, since it uses less digits than its factorization.

71323665513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23774555174.

The product of its digits is 340200, while the sum is 42.

The spelling of 71323665513 in words is "seventy-one billion, three hundred twenty-three million, six hundred sixty-five thousand, five hundred thirteen".