636440707056 has 80 divisors (see below), whose sum is σ = 2049835016448. Its totient is φ = 165309273600.

The previous prime is 636440707043. The next prime is 636440707069. The reversal of 636440707056 is 650707044636.

It is an interprime number because it is at equal distance from previous prime (636440707043) and next prime (636440707069).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 636440706996 and 636440707014.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86094885 + ... + 86102276.

Almost surely, 2^636440707056 is an apocalyptic number.

636440707056 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

636440707056 is an abundant number, since it is smaller than the sum of its proper divisors (1413394309392).

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

636440707056 is a wasteful number, since it uses less digits than its factorization.

636440707056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172197190 (or 172197184 counting only the distinct ones).

The product of its (nonzero) digits is 2540160, while the sum is 48.

The spelling of 636440707056 in words is "six hundred thirty-six billion, four hundred forty million, seven hundred seven thousand, fifty-six".