639166703394 has 16 divisors (see below), whose sum is σ = 1281384326880. Its totient is φ = 212547081120.

The previous prime is 639166703393. The next prime is 639166703411. The reversal of 639166703394 is 493307661936.

It is a super-3 number, since 3×639166703394³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (639166703393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127118947 + ... + 127123974.

It is an arithmetic number, because the mean of its divisors is an integer number (80086520430).

Almost surely, 2^639166703394 is an apocalyptic number.

639166703394 is an abundant number, since it is smaller than the sum of its proper divisors (642217623486).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

639166703394 is a wasteful number, since it uses less digits than its factorization.

639166703394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254243345.

The product of its (nonzero) digits is 13226976, while the sum is 57.

The spelling of 639166703394 in words is "six hundred thirty-nine billion, one hundred sixty-six million, seven hundred three thousand, three hundred ninety-four".