638407362616 has 16 divisors (see below), whose sum is σ = 1197031013640. Its totient is φ = 319199092320.

The previous prime is 638407362611. The next prime is 638407362653. The reversal of 638407362616 is 616263704836.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638407362611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58615 + ... + 1131481.

Almost surely, 2^638407362616 is an apocalyptic number.

It is an amenable number.

638407362616 is a deficient number, since it is larger than the sum of its proper divisors (558623651024).

638407362616 is a wasteful number, since it uses less digits than its factorization.

638407362616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1147254 (or 1147250 counting only the distinct ones).

The product of its (nonzero) digits is 5225472, while the sum is 52.

The spelling of 638407362616 in words is "six hundred thirty-eight billion, four hundred seven million, three hundred sixty-two thousand, six hundred sixteen".