40879415781 has 48 divisors (see below), whose sum is σ = 63085651200. Its totient is φ = 25433243136.

The previous prime is 40879415771. The next prime is 40879415803. The reversal of 40879415781 is 18751497804.

40879415781 is a `hidden beast` number, since 408 + 7 + 9 + 4 + 157 + 81 = 666.

It is not a de Polignac number, because 40879415781 - 2¹¹ = 40879413733 is a prime.

It is a super-2 number, since 2×40879415781² (a number of 22 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40879415771) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13767265 + ... + 13770233.

It is an arithmetic number, because the mean of its divisors is an integer number (1314284400).

Almost surely, 2^40879415781 is an apocalyptic number.

It is an amenable number.

40879415781 is a deficient number, since it is larger than the sum of its proper divisors (22206235419).

40879415781 is a wasteful number, since it uses less digits than its factorization.

40879415781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4170 (or 4167 counting only the distinct ones).

The product of its (nonzero) digits is 2257920, while the sum is 54.

The spelling of 40879415781 in words is "forty billion, eight hundred seventy-nine million, four hundred fifteen thousand, seven hundred eighty-one".