638365480500 has 96 divisors (see below), whose sum is σ = 2027913084288. Its totient is φ = 154755264000.

The previous prime is 638365480481. The next prime is 638365480547. The reversal of 638365480500 is 5084563836.

It is a self number, because there is not a number n which added to its sum of digits gives 638365480500.

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, 19327909 + ... + 19360908.

It is an arithmetic number, because the mean of its divisors is an integer number (21124094628).

Almost surely, 2^638365480500 is an apocalyptic number.

638365480500 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

638365480500 is an abundant number, since it is smaller than the sum of its proper divisors (1389547603788).

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

638365480500 is a wasteful number, since it uses less digits than its factorization.

638365480500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38688850 (or 38688838 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 48.

The spelling of 638365480500 in words is "six hundred thirty-eight billion, three hundred sixty-five million, four hundred eighty thousand, five hundred".