638613825542 has 64 divisors (see below), whose sum is σ = 1248210915840. Its totient is φ = 237754137600.

The previous prime is 638613825491. The next prime is 638613825611. The reversal of 638613825542 is 245528316836.

It is a happy number.

It is a super-3 number, since 3×638613825542³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 303884 + ... + 1170287.

It is an arithmetic number, because the mean of its divisors is an integer number (19503295560).

Almost surely, 2^638613825542 is an apocalyptic number.

638613825542 is a deficient number, since it is larger than the sum of its proper divisors (609597090298).

638613825542 is a wasteful number, since it uses less digits than its factorization.

638613825542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1474317.

The product of its digits is 8294400, while the sum is 53.

The spelling of 638613825542 in words is "six hundred thirty-eight billion, six hundred thirteen million, eight hundred twenty-five thousand, five hundred forty-two".