638352041678 has 16 divisors (see below), whose sum is σ = 1031630371296. Its totient is φ = 294496503840.

The previous prime is 638352041653. The next prime is 638352041693. The reversal of 638352041678 is 876140253836.

It is a happy number.

638352041678 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×638352041678² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5251901 + ... + 5372072.

It is an arithmetic number, because the mean of its divisors is an integer number (64476898206).

Almost surely, 2^638352041678 is an apocalyptic number.

638352041678 is a deficient number, since it is larger than the sum of its proper divisors (393278329618).

638352041678 is a wasteful number, since it uses less digits than its factorization.

638352041678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10626299.

The product of its (nonzero) digits is 5806080, while the sum is 53.

The spelling of 638352041678 in words is "six hundred thirty-eight billion, three hundred fifty-two million, forty-one thousand, six hundred seventy-eight".