638101804890051 has 112 divisors (see below), whose sum is σ = 1009940476083840. Its totient is φ = 401863924788480.

The previous prime is 638101804890047. The next prime is 638101804890103. The reversal of 638101804890051 is 150098408101836.

It is a happy number.

638101804890051 is a `hidden beast` number, since 6 + 3 + 8 + 101 + 8 + 0 + 489 + 0 + 0 + 51 = 666.

638101804890051 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 638101804890051 - 2² = 638101804890047 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 638101804890051.

It is not an unprimeable number, because it can be changed into a prime (638101804890041) by changing a digit.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 7162958556 + ... + 7163047638.

It is an arithmetic number, because the mean of its divisors is an integer number (9017325679320).

Almost surely, 2^{638101804890051} is an apocalyptic number.

638101804890051 is a deficient number, since it is larger than the sum of its proper divisors (371838671193789).

638101804890051 is an equidigital number, since it uses as much as digits as its factorization.

638101804890051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90588 (or 90573 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 54.

The spelling of 638101804890051 in words is "six hundred thirty-eight trillion, one hundred one billion, eight hundred four million, eight hundred ninety thousand, fifty-one".