71785923631 has 2 divisors, whose sum is σ = 71785923632. Its totient is φ = 71785923630.

The previous prime is 71785923581. The next prime is 71785923679. The reversal of 71785923631 is 13632958717.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71785923631 is a prime.

It is a super-2 number, since 2×71785923631² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71785923931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35892961815 + 35892961816.

It is an arithmetic number, because the mean of its divisors is an integer number (35892961816).

Almost surely, 2^71785923631 is an apocalyptic number.

71785923631 is a deficient number, since it is larger than the sum of its proper divisors (1).

71785923631 is an equidigital number, since it uses as much as digits as its factorization.

71785923631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1905120, while the sum is 52.

The spelling of 71785923631 in words is "seventy-one billion, seven hundred eighty-five million, nine hundred twenty-three thousand, six hundred thirty-one".