639654005331 has 12 divisors (see below), whose sum is σ = 1007939644920. Its totient is φ = 387669094080.

The previous prime is 639654005321. The next prime is 639654005351. The reversal of 639654005331 is 133500456936.

639654005331 is a `hidden beast` number, since 63 + 9 + 6 + 54 + 0 + 0 + 533 + 1 = 666.

639654005331 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 639654005331 - 2¹⁰ = 639654004307 is a prime.

It is a super-2 number, since 2×639654005331² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (639654005311) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3230575686 + ... + 3230575883.

It is an arithmetic number, because the mean of its divisors is an integer number (83994970410).

Almost surely, 2^639654005331 is an apocalyptic number.

639654005331 is a deficient number, since it is larger than the sum of its proper divisors (368285639589).

639654005331 is a wasteful number, since it uses less digits than its factorization.

639654005331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6461151586 (or 6461151583 counting only the distinct ones).

The product of its (nonzero) digits is 874800, while the sum is 45.

The spelling of 639654005331 in words is "six hundred thirty-nine billion, six hundred fifty-four million, five thousand, three hundred thirty-one".