636341311620 has 432 divisors, whose sum is σ = 2502597202560. Its totient is φ = 129688086528.

The previous prime is 636341311609. The next prime is 636341311667. The reversal of 636341311620 is 26113143636.

636341311620 is a `hidden beast` number, since 6 + 3 + 6 + 3 + 4 + 13 + 11 + 620 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 2737177 + ... + 2960543.

It is an arithmetic number, because the mean of its divisors is an integer number (5793049080).

Almost surely, 2^636341311620 is an apocalyptic number.

636341311620 is a gapful number since it is divisible by the number (60) 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 636341311620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1251298601280).

636341311620 is an abundant number, since it is smaller than the sum of its proper divisors (1866255890940).

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

636341311620 is a wasteful number, since it uses less digits than its factorization.

636341311620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223432 (or 223420 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 36.

The spelling of 636341311620 in words is "six hundred thirty-six billion, three hundred forty-one million, three hundred eleven thousand, six hundred twenty".