638867735355 has 8 divisors (see below), whose sum is σ = 1022188376592. Its totient is φ = 340729458848.

The previous prime is 638867735273. The next prime is 638867735377. The reversal of 638867735355 is 553537768836.

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 638867735355 - 2⁷ = 638867735227 is a prime.

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, 21295591164 + ... + 21295591193.

It is an arithmetic number, because the mean of its divisors is an integer number (127773547074).

Almost surely, 2^638867735355 is an apocalyptic number.

638867735355 is a deficient number, since it is larger than the sum of its proper divisors (383320641237).

638867735355 is a wasteful number, since it uses less digits than its factorization.

638867735355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42591182365.

The product of its digits is 381024000, while the sum is 66.

The spelling of 638867735355 in words is "six hundred thirty-eight billion, eight hundred sixty-seven million, seven hundred thirty-five thousand, three hundred fifty-five".