40656872168 has 24 divisors (see below), whose sum is σ = 83791799490. Its totient is φ = 18480396000.

The previous prime is 40656872153. The next prime is 40656872233. The reversal of 40656872168 is 86127865604.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 34240541764 + 6416330404 = 185042^2 + 80102^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20999483 + ... + 21001418.

Almost surely, 2^40656872168 is an apocalyptic number.

It is an amenable number.

40656872168 is an abundant number, since it is smaller than the sum of its proper divisors (43134927322).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40656872168 is a wasteful number, since it uses less digits than its factorization.

40656872168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42000929 (or 42000914 counting only the distinct ones).

The product of its (nonzero) digits is 3870720, while the sum is 53.

The spelling of 40656872168 in words is "forty billion, six hundred fifty-six million, eight hundred seventy-two thousand, one hundred sixty-eight".