71634875831 has 4 divisors (see below), whose sum is σ = 71784427200. Its totient is φ = 71485324464.

The previous prime is 71634875797. The next prime is 71634875833. The reversal of 71634875831 is 13857843617.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71634875831 is a prime.

It is a super-2 number, since 2×71634875831² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71634875833) 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, 74774966 + ... + 74775923.

It is an arithmetic number, because the mean of its divisors is an integer number (17946106800).

Almost surely, 2^71634875831 is an apocalyptic number.

71634875831 is a deficient number, since it is larger than the sum of its proper divisors (149551369).

71634875831 is a wasteful number, since it uses less digits than its factorization.

71634875831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149551368.

The product of its digits is 3386880, while the sum is 53.

The spelling of 71634875831 in words is "seventy-one billion, six hundred thirty-four million, eight hundred seventy-five thousand, eight hundred thirty-one".