639730940067 has 16 divisors (see below), whose sum is σ = 948164039680. Its totient is φ = 426300768936.

The previous prime is 639730940053. The next prime is 639730940071. The reversal of 639730940067 is 760049037936.

639730940067 is a `hidden beast` number, since 63 + 97 + 30 + 9 + 400 + 67 = 666.

It is not a de Polignac number, because 639730940067 - 2¹¹ = 639730938019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 639730939995 and 639730940022.

It is not an unprimeable number, because it can be changed into a prime (639730940027) 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 15 ways as a sum of consecutive naturals, for example, 5118343 + ... + 5241840.

It is an arithmetic number, because the mean of its divisors is an integer number (59260252480).

Almost surely, 2^639730940067 is an apocalyptic number.

639730940067 is a deficient number, since it is larger than the sum of its proper divisors (308433099613).

639730940067 is a wasteful number, since it uses less digits than its factorization.

639730940067 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10362479 (or 10362473 counting only the distinct ones).

The product of its (nonzero) digits is 5143824, while the sum is 54.

The spelling of 639730940067 in words is "six hundred thirty-nine billion, seven hundred thirty million, nine hundred forty thousand, sixty-seven".