40626836721 has 9 divisors (see below), whose sum is σ = 58684082041. Its totient is φ = 27084154692.

The previous prime is 40626836693. The next prime is 40626836779. The reversal of 40626836721 is 12763862604.

The square root of 40626836721 is 201561.

It is a perfect power (a square), and thus also a powerful number.

40626836721 is a `hidden beast` number, since 4 + 0 + 6 + 268 + 367 + 21 = 666.

40626836721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 40626836721 - 2²¹ = 40624739569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40626836221) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 571090 + ... + 638276.

Almost surely, 2^40626836721 is an apocalyptic number.

40626836721 is the 201561-st square number.

40626836721 is the 100781-st centered octagonal number.

It is an amenable number.

40626836721 is a deficient number, since it is larger than the sum of its proper divisors (18057245320).

40626836721 is an frugal number, since it uses more digits than its factorization.

40626836721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134380 (or 67190 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 45.

The spelling of 40626836721 in words is "forty billion, six hundred twenty-six million, eight hundred thirty-six thousand, seven hundred twenty-one".