638580736854 has 64 divisors (see below), whose sum is σ = 1493887104000. Its totient is φ = 201639391200.

The previous prime is 638580736847. The next prime is 638580736877. The reversal of 638580736854 is 458637085836.

It is a happy number.

638580736854 is a `hidden beast` number, since 6 + 385 + 80 + 73 + 68 + 54 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 638580736791 and 638580736800.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16631779 + ... + 16670129.

It is an arithmetic number, because the mean of its divisors is an integer number (23341986000).

Almost surely, 2^638580736854 is an apocalyptic number.

638580736854 is an abundant number, since it is smaller than the sum of its proper divisors (855306367146).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

638580736854 is a wasteful number, since it uses less digits than its factorization.

638580736854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54610 (or 54604 counting only the distinct ones).

The product of its (nonzero) digits is 116121600, while the sum is 63.

The spelling of 638580736854 in words is "six hundred thirty-eight billion, five hundred eighty million, seven hundred thirty-six thousand, eight hundred fifty-four".