40064425921 has 27 divisors (see below), whose sum is σ = 44131389339. Its totient is φ = 36355642752.

The previous prime is 40064425901. The next prime is 40064425937. The reversal of 40064425921 is 12952446004.

The square root of 40064425921 is 200161.

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

It can be written as a sum of positive squares in 13 ways, for example, as 29364592321 + 10699833600 = 171361^2 + 103440^2 .

It is not a de Polignac number, because 40064425921 - 2³³ = 31474491329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40064425901) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 231586191 + ... + 231586363.

Almost surely, 2^40064425921 is an apocalyptic number.

40064425921 is the 200161-st square number.

40064425921 is the 100081-st centered octagonal number.

It is an amenable number.

40064425921 is a deficient number, since it is larger than the sum of its proper divisors (4066963418).

40064425921 is an frugal number, since it uses more digits than its factorization.

40064425921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550 (or 275 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 37.

The spelling of 40064425921 in words is "forty billion, sixty-four million, four hundred twenty-five thousand, nine hundred twenty-one".