639814533121 has 16 divisors (see below), whose sum is σ = 656600091840. Its totient is φ = 623117214720.

The previous prime is 639814533091. The next prime is 639814533133. The reversal of 639814533121 is 121335418936.

It is a cyclic number.

It is not a de Polignac number, because 639814533121 - 2³¹ = 637667049473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (639814533521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38926521 + ... + 38942953.

It is an arithmetic number, because the mean of its divisors is an integer number (41037505740).

Almost surely, 2^639814533121 is an apocalyptic number.

It is an amenable number.

639814533121 is a deficient number, since it is larger than the sum of its proper divisors (16785558719).

639814533121 is a wasteful number, since it uses less digits than its factorization.

639814533121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19056.

The product of its digits is 466560, while the sum is 46.

The spelling of 639814533121 in words is "six hundred thirty-nine billion, eight hundred fourteen million, five hundred thirty-three thousand, one hundred twenty-one".