3640654521 has 48 divisors (see below), whose sum is σ = 6374234880. Its totient is φ = 1957253760.

The previous prime is 3640654471. The next prime is 3640654561. The reversal of 3640654521 is 1254560463.

3640654521 is a `hidden beast` number, since 3 + 640 + 6 + 5 + 4 + 5 + 2 + 1 = 666.

It is not a de Polignac number, because 3640654521 - 2¹¹ = 3640652473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3640654561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 67795 + ... + 108983.

It is an arithmetic number, because the mean of its divisors is an integer number (132796560).

Almost surely, 2^3640654521 is an apocalyptic number.

It is an amenable number.

3640654521 is a deficient number, since it is larger than the sum of its proper divisors (2733580359).

3640654521 is a wasteful number, since it uses less digits than its factorization.

3640654521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41286 (or 41283 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

The square root of 3640654521 is about 60337.8365621440. The cubic root of 3640654521 is about 1538.3665314815.

The spelling of 3640654521 in words is "three billion, six hundred forty million, six hundred fifty-four thousand, five hundred twenty-one".