71115561623 has 4 divisors (see below), whose sum is σ = 71118461688. Its totient is φ = 71112661560.

The previous prime is 71115561599. The next prime is 71115561641. The reversal of 71115561623 is 32616551117.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 71115561623 - 2¹⁰ = 71115560599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71115561683) 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, 1412933 + ... + 1462398.

It is an arithmetic number, because the mean of its divisors is an integer number (17779615422).

Almost surely, 2^71115561623 is an apocalyptic number.

71115561623 is a deficient number, since it is larger than the sum of its proper divisors (2900065).

71115561623 is a wasteful number, since it uses less digits than its factorization.

71115561623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2900064.

The product of its digits is 37800, while the sum is 38.

The spelling of 71115561623 in words is "seventy-one billion, one hundred fifteen million, five hundred sixty-one thousand, six hundred twenty-three".