636894426542 has 24 divisors (see below), whose sum is σ = 1050141008448. Its totient is φ = 289482374720.

The previous prime is 636894426517. The next prime is 636894426557. The reversal of 636894426542 is 245624498636.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5522723 + ... + 5636865.

It is an arithmetic number, because the mean of its divisors is an integer number (43755875352).

Almost surely, 2^636894426542 is an apocalyptic number.

636894426542 is a deficient number, since it is larger than the sum of its proper divisors (413246581906).

636894426542 is a wasteful number, since it uses less digits than its factorization.

636894426542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137224 (or 137213 counting only the distinct ones).

The product of its digits is 59719680, while the sum is 59.

The spelling of 636894426542 in words is "six hundred thirty-six billion, eight hundred ninety-four million, four hundred twenty-six thousand, five hundred forty-two".