636543345636 has 96 divisors (see below), whose sum is σ = 1801837699200. Its totient is φ = 192729807360.

The previous prime is 636543345629. The next prime is 636543345643.

It is a happy number.

636543345636 is a `hidden beast` number, since 6 + 3 + 6 + 5 + 43 + 34 + 563 + 6 = 666.

636543345636 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (636543345629) and next prime (636543345643).

It is a Harshad number since it is a multiple of its sum of digits (54).

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, 1192720 + ... + 1641848.

It is an arithmetic number, because the mean of its divisors is an integer number (18769142700).

Almost surely, 2^636543345636 is an apocalyptic number.

636543345636 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 636543345636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (900918849600).

636543345636 is an abundant number, since it is smaller than the sum of its proper divisors (1165294353564).

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

636543345636 is a wasteful number, since it uses less digits than its factorization.

636543345636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450346 (or 450338 counting only the distinct ones).

The product of its digits is 41990400, while the sum is 54.

The spelling of 636543345636 in words is "six hundred thirty-six billion, five hundred forty-three million, three hundred forty-five thousand, six hundred thirty-six".