639877495609 has 8 divisors (see below), whose sum is σ = 698341133952. Its totient is φ = 581462683440.

The previous prime is 639877495589. The next prime is 639877495637. The reversal of 639877495609 is 906594778936.

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

It is a cyclic number.

It is not a de Polignac number, because 639877495609 - 2³³ = 631287561017 is a prime.

It is not an unprimeable number, because it can be changed into a prime (639877495669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12179134 + ... + 12231559.

It is an arithmetic number, because the mean of its divisors is an integer number (87292641744).

Almost surely, 2^639877495609 is an apocalyptic number.

It is an amenable number.

639877495609 is a deficient number, since it is larger than the sum of its proper divisors (58463638343).

639877495609 is a wasteful number, since it uses less digits than its factorization.

639877495609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24413087.

The product of its (nonzero) digits is 617258880, while the sum is 73.

The spelling of 639877495609 in words is "six hundred thirty-nine billion, eight hundred seventy-seven million, four hundred ninety-five thousand, six hundred nine".