638613782677 has 16 divisors (see below), whose sum is σ = 702808791552. Its totient is φ = 576587404800.

The previous prime is 638613782671. The next prime is 638613782689. The reversal of 638613782677 is 776287316836.

It is a cyclic number.

It is not a de Polignac number, because 638613782677 - 2³ = 638613782669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638613782671) 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, 656677 + ... + 1307077.

It is an arithmetic number, because the mean of its divisors is an integer number (43925549472).

Almost surely, 2^638613782677 is an apocalyptic number.

It is an amenable number.

638613782677 is a deficient number, since it is larger than the sum of its proper divisors (64195008875).

638613782677 is a wasteful number, since it uses less digits than its factorization.

638613782677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652068.

The product of its digits is 85349376, while the sum is 64.

The spelling of 638613782677 in words is "six hundred thirty-eight billion, six hundred thirteen million, seven hundred eighty-two thousand, six hundred seventy-seven".