638615372485 has 8 divisors (see below), whose sum is σ = 768802559616. Its totient is φ = 509249556240.

The previous prime is 638615372471. The next prime is 638615372509. The reversal of 638615372485 is 584273516836.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 638615372485 - 2⁷ = 638615372357 is a prime.

It is a Duffinian number.

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, 205341009 + ... + 205344118.

It is an arithmetic number, because the mean of its divisors is an integer number (96100319952).

Almost surely, 2^638615372485 is an apocalyptic number.

It is an amenable number.

638615372485 is a deficient number, since it is larger than the sum of its proper divisors (130187187131).

638615372485 is a wasteful number, since it uses less digits than its factorization.

638615372485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410685443.

The product of its digits is 29030400, while the sum is 58.

The spelling of 638615372485 in words is "six hundred thirty-eight billion, six hundred fifteen million, three hundred seventy-two thousand, four hundred eighty-five".