638638070705 has 8 divisors (see below), whose sum is σ = 766422689472. Its totient is φ = 510872453488.

The previous prime is 638638070671. The next prime is 638638070713. The reversal of 638638070705 is 507070836836.

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

It is a cyclic number.

It is not a de Polignac number, because 638638070705 - 2⁶ = 638638070641 is a prime.

It is a Duffinian 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, 4676339 + ... + 4810968.

It is an arithmetic number, because the mean of its divisors is an integer number (95802836184).

Almost surely, 2^638638070705 is an apocalyptic number.

It is an amenable number.

638638070705 is a deficient number, since it is larger than the sum of its proper divisors (127784618767).

638638070705 is a wasteful number, since it uses less digits than its factorization.

638638070705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9500775.

The product of its (nonzero) digits is 5080320, while the sum is 53.

The spelling of 638638070705 in words is "six hundred thirty-eight billion, six hundred thirty-eight million, seventy thousand, seven hundred five".