636115505644 has 24 divisors (see below), whose sum is σ = 1153385100000. Its totient is φ = 306611128320.

The previous prime is 636115505633. The next prime is 636115505647. The reversal of 636115505644 is 446505511636.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 636115505594 and 636115505603.

It is not an unprimeable number, because it can be changed into a prime (636115505647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4203144 + ... + 4351855.

It is an arithmetic number, because the mean of its divisors is an integer number (48057712500).

Almost surely, 2^636115505644 is an apocalyptic number.

It is an amenable number.

636115505644 is a deficient number, since it is larger than the sum of its proper divisors (517269594356).

636115505644 is a wasteful number, since it uses less digits than its factorization.

636115505644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8555673 (or 8555671 counting only the distinct ones).

The product of its (nonzero) digits is 1296000, while the sum is 46.

The spelling of 636115505644 in words is "six hundred thirty-six billion, one hundred fifteen million, five hundred five thousand, six hundred forty-four".