638147456544 has 384 divisors, whose sum is σ = 1911826022400. Its totient is φ = 185009909760.

The previous prime is 638147456533. The next prime is 638147456563. The reversal of 638147456544 is 445654741836.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 285013377 + ... + 285015615.

It is an arithmetic number, because the mean of its divisors is an integer number (4978713600).

Almost surely, 2^638147456544 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 638147456544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (955913011200).

638147456544 is an abundant number, since it is smaller than the sum of its proper divisors (1273678565856).

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

638147456544 is a wasteful number, since it uses less digits than its factorization.

638147456544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2488 (or 2480 counting only the distinct ones).

The product of its digits is 38707200, while the sum is 57.

The spelling of 638147456544 in words is "six hundred thirty-eight billion, one hundred forty-seven million, four hundred fifty-six thousand, five hundred forty-four".