7644660001636 has 48 divisors (see below), whose sum is σ = 15408689184000. Its totient is φ = 3250751626368.

The previous prime is 7644660001621. The next prime is 7644660001639. The reversal of 7644660001636 is 6361000664467.

It is a super-2 number, since 2×7644660001636² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 7644660001636.

It is not an unprimeable number, because it can be changed into a prime (7644660001639) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2837130 + ... + 4831006.

It is an arithmetic number, because the mean of its divisors is an integer number (321014358000).

Almost surely, 2^{7644660001636} is an apocalyptic number.

It is an amenable number.

7644660001636 is an abundant number, since it is smaller than the sum of its proper divisors (7764029182364).

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

7644660001636 is a wasteful number, since it uses less digits than its factorization.

7644660001636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1994956 (or 1994954 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 49.

The spelling of 7644660001636 in words is "seven trillion, six hundred forty-four billion, six hundred sixty million, one thousand, six hundred thirty-six".