638613621701 has 32 divisors (see below), whose sum is σ = 734630757120. Its totient is φ = 549707558400.

The previous prime is 638613621691. The next prime is 638613621757. The reversal of 638613621701 is 107126316836.

It is not a de Polignac number, because 638613621701 - 2⁶ = 638613621637 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 (638613621761) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 42615056 + ... + 42630038.

It is an arithmetic number, because the mean of its divisors is an integer number (22957211160).

Almost surely, 2^638613621701 is an apocalyptic number.

It is an amenable number.

638613621701 is a deficient number, since it is larger than the sum of its proper divisors (96017135419).

638613621701 is a wasteful number, since it uses less digits than its factorization.

638613621701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17597.

The product of its (nonzero) digits is 217728, while the sum is 44.

The spelling of 638613621701 in words is "six hundred thirty-eight billion, six hundred thirteen million, six hundred twenty-one thousand, seven hundred one".