663938601639 has 16 divisors (see below), whose sum is σ = 886434900480. Its totient is φ = 442034331200.

The previous prime is 663938601619. The next prime is 663938601649. The reversal of 663938601639 is 936106839366.

663938601639 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 663938601639 - 2⁸ = 663938601383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663938601619) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8910739 + ... + 8984939.

It is an arithmetic number, because the mean of its divisors is an integer number (55402181280).

Almost surely, 2^663938601639 is an apocalyptic number.

663938601639 is a deficient number, since it is larger than the sum of its proper divisors (222496298841).

663938601639 is a wasteful number, since it uses less digits than its factorization.

663938601639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78150.

The product of its (nonzero) digits is 22674816, while the sum is 60.

The spelling of 663938601639 in words is "six hundred sixty-three billion, nine hundred thirty-eight million, six hundred one thousand, six hundred thirty-nine".