40518078868 has 24 divisors (see below), whose sum is σ = 75084131304. Its totient is φ = 19065676800.

The previous prime is 40518078863. The next prime is 40518078889. The reversal of 40518078868 is 86887081504.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 26738136324 + 13779942544 = 163518^2 + 117388^2 .

It is a super-2 number, since 2×40518078868² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40518078863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1162008 + ... + 1196368.

It is an arithmetic number, because the mean of its divisors is an integer number (3128505471).

Almost surely, 2^40518078868 is an apocalyptic number.

It is an amenable number.

40518078868 is a deficient number, since it is larger than the sum of its proper divisors (34566052436).

40518078868 is a wasteful number, since it uses less digits than its factorization.

40518078868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51723 (or 51721 counting only the distinct ones).

The product of its (nonzero) digits is 3440640, while the sum is 55.

The spelling of 40518078868 in words is "forty billion, five hundred eighteen million, seventy-eight thousand, eight hundred sixty-eight".