638757790055 has 32 divisors (see below), whose sum is σ = 965109938688. Its totient is φ = 394244208000.

The previous prime is 638757790051. The next prime is 638757790133. The reversal of 638757790055 is 550097757836.

It is not a de Polignac number, because 638757790055 - 2² = 638757790051 is a prime.

It is a super-3 number, since 3×638757790055³ (a number of 36 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 638757790055.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638757790051) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8174537 + ... + 8252306.

It is an arithmetic number, because the mean of its divisors is an integer number (30159685584).

Almost surely, 2^638757790055 is an apocalyptic number.

638757790055 is a deficient number, since it is larger than the sum of its proper divisors (326352148633).

638757790055 is a wasteful number, since it uses less digits than its factorization.

638757790055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16426967.

The product of its (nonzero) digits is 55566000, while the sum is 62.

The spelling of 638757790055 in words is "six hundred thirty-eight billion, seven hundred fifty-seven million, seven hundred ninety thousand, fifty-five".