639703089637 has 8 divisors (see below), whose sum is σ = 642370351392. Its totient is φ = 637036770000.

The previous prime is 639703089629. The next prime is 639703089643. The reversal of 639703089637 is 736980307936.

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 639703089637 - 2³ = 639703089629 is a prime.

It is a super-2 number, since 2×639703089637² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639703089667) 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, 1142062 + ... + 1607392.

It is an arithmetic number, because the mean of its divisors is an integer number (80296293924).

Almost surely, 2^639703089637 is an apocalyptic number.

It is an amenable number.

639703089637 is a deficient number, since it is larger than the sum of its proper divisors (2667261755).

639703089637 is a wasteful number, since it uses less digits than its factorization.

639703089637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471059.

The product of its (nonzero) digits is 30862944, while the sum is 61.

The spelling of 639703089637 in words is "six hundred thirty-nine billion, seven hundred three million, eighty-nine thousand, six hundred thirty-seven".