1636117275664 has 45 divisors (see below), whose sum is σ = 3206887679863. Its totient is φ = 808641844736.

The previous prime is 1636117275641. The next prime is 1636117275703. The reversal of 1636117275664 is 4665727116361.

The square root of 1636117275664 is 1279108.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 401778499600 + 1234338776064 = 633860^2 + 1111008^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 455360652 + ... + 455364244.

Almost surely, 2^{1636117275664} is an apocalyptic number.

1636117275664 is the 1279108-th square number.

It is an amenable number.

1636117275664 is a deficient number, since it is larger than the sum of its proper divisors (1570770404199).

1636117275664 is an frugal number, since it uses more digits than its factorization.

1636117275664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7372 (or 3684 counting only the distinct ones).

The product of its digits is 7620480, while the sum is 55.

The spelling of 1636117275664 in words is "one trillion, six hundred thirty-six billion, one hundred seventeen million, two hundred seventy-five thousand, six hundred sixty-four".