40656157831 has 4 divisors (see below), whose sum is σ = 40663282464. Its totient is φ = 40649033200.

The previous prime is 40656157813. The next prime is 40656157921. The reversal of 40656157831 is 13875165604.

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 40656157831 - 2⁹ = 40656157319 is a prime.

It is a super-2 number, since 2×40656157831² (a number of 22 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 (40656137831) 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, 3553750 + ... + 3565171.

It is an arithmetic number, because the mean of its divisors is an integer number (10165820616).

Almost surely, 2^40656157831 is an apocalyptic number.

40656157831 is a deficient number, since it is larger than the sum of its proper divisors (7124633).

40656157831 is an equidigital number, since it uses as much as digits as its factorization.

40656157831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7124632.

The product of its (nonzero) digits is 604800, while the sum is 46.

The spelling of 40656157831 in words is "forty billion, six hundred fifty-six million, one hundred fifty-seven thousand, eight hundred thirty-one".