40805778856 has 32 divisors (see below), whose sum is σ = 79655158440. Its totient is φ = 19579511808.

The previous prime is 40805778851. The next prime is 40805778899. The reversal of 40805778856 is 65887750804.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 35019133956 + 5786644900 = 187134^2 + 76070^2 .

It is a super-2 number, since 2×40805778856² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 40805778856.

It is not an unprimeable number, because it can be changed into a prime (40805778851) 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, 922621 + ... + 965836.

Almost surely, 2^40805778856 is an apocalyptic number.

It is an amenable number.

40805778856 is a deficient number, since it is larger than the sum of its proper divisors (38849379584).

40805778856 is a wasteful number, since it uses less digits than its factorization.

40805778856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1888573 (or 1888569 counting only the distinct ones).

The product of its (nonzero) digits is 15052800, while the sum is 58.

The spelling of 40805778856 in words is "forty billion, eight hundred five million, seven hundred seventy-eight thousand, eight hundred fifty-six".