71856531933 has 16 divisors (see below), whose sum is σ = 99918905856. Its totient is φ = 45881118720.

The previous prime is 71856531931. The next prime is 71856531953. The reversal of 71856531933 is 33913565817.

It is not a de Polignac number, because 71856531933 - 2¹ = 71856531931 is a prime.

It is a super-2 number, since 2×71856531933² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71856531931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3973716 + ... + 3991757.

It is an arithmetic number, because the mean of its divisors is an integer number (6244931616).

Almost surely, 2^71856531933 is an apocalyptic number.

It is an amenable number.

71856531933 is a deficient number, since it is larger than the sum of its proper divisors (28062373923).

71856531933 is a wasteful number, since it uses less digits than its factorization.

71856531933 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7965604.

The product of its digits is 2041200, while the sum is 51.

The spelling of 71856531933 in words is "seventy-one billion, eight hundred fifty-six million, five hundred thirty-one thousand, nine hundred thirty-three".