638654007522 has 16 divisors (see below), whose sum is σ = 1296372314592. Its totient is φ = 209707285920.

The previous prime is 638654007521. The next prime is 638654007547. The reversal of 638654007522 is 225700456836.

638654007522 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (638654007521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 794345379 + ... + 794346182.

It is an arithmetic number, because the mean of its divisors is an integer number (81023269662).

Almost surely, 2^638654007522 is an apocalyptic number.

638654007522 is an abundant number, since it is smaller than the sum of its proper divisors (657718307070).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

638654007522 is a wasteful number, since it uses less digits than its factorization.

638654007522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1588691633.

The product of its (nonzero) digits is 2419200, while the sum is 48.

The spelling of 638654007522 in words is "six hundred thirty-eight billion, six hundred fifty-four million, seven thousand, five hundred twenty-two".