638615545736 has 16 divisors (see below), whose sum is σ = 1368461883840. Its totient is φ = 273692376720.

The previous prime is 638615545723. The next prime is 638615545769. The reversal of 638615545736 is 637545516836.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5701924460 + ... + 5701924571.

It is an arithmetic number, because the mean of its divisors is an integer number (85528867740).

Almost surely, 2^638615545736 is an apocalyptic number.

It is an amenable number.

638615545736 is an abundant number, since it is smaller than the sum of its proper divisors (729846338104).

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

638615545736 is a wasteful number, since it uses less digits than its factorization.

638615545736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11403849044 (or 11403849040 counting only the distinct ones).

The product of its digits is 54432000, while the sum is 59.

The spelling of 638615545736 in words is "six hundred thirty-eight billion, six hundred fifteen million, five hundred forty-five thousand, seven hundred thirty-six".