639005790666 has 8 divisors (see below), whose sum is σ = 1278011581344. Its totient is φ = 213001930220.

The previous prime is 639005790617. The next prime is 639005790667. The reversal of 639005790666 is 666097500936.

639005790666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

639005790666 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (639005790667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53250482550 + ... + 53250482561.

It is an arithmetic number, because the mean of its divisors is an integer number (159751447668).

Almost surely, 2^639005790666 is an apocalyptic number.

639005790666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

639005790666 is a wasteful number, since it uses less digits than its factorization.

639005790666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106500965116.

The product of its (nonzero) digits is 11022480, while the sum is 57.

The spelling of 639005790666 in words is "six hundred thirty-nine billion, five million, seven hundred ninety thousand, six hundred sixty-six".