636434526040 has 16 divisors (see below), whose sum is σ = 1431977683680. Its totient is φ = 254573810400.

The previous prime is 636434526023. The next prime is 636434526053. The reversal of 636434526040 is 40625434636.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7955431536 + ... + 7955431615.

It is an arithmetic number, because the mean of its divisors is an integer number (89498605230).

Almost surely, 2^636434526040 is an apocalyptic number.

It is an amenable number.

636434526040 is an abundant number, since it is smaller than the sum of its proper divisors (795543157640).

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

636434526040 is a wasteful number, since it uses less digits than its factorization.

636434526040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15910863162 (or 15910863158 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 43.

The spelling of 636434526040 in words is "six hundred thirty-six billion, four hundred thirty-four million, five hundred twenty-six thousand, forty".