1661100665632 has 24 divisors (see below), whose sum is σ = 3300294620700. Its totient is φ = 822930603264.

The previous prime is 1661100665611. The next prime is 1661100665663. The reversal of 1661100665632 is 2365660011661.

It can be written as a sum of positive squares in 2 ways, for example, as 1653991477776 + 7109187856 = 1286076^2 + 84316^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 238113007 + ... + 238119982.

Almost surely, 2^{1661100665632} is an apocalyptic number.

It is an amenable number.

1661100665632 is a deficient number, since it is larger than the sum of its proper divisors (1639193955068).

1661100665632 is a wasteful number, since it uses less digits than its factorization.

1661100665632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476233108 (or 476233100 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 43.

The spelling of 1661100665632 in words is "one trillion, six hundred sixty-one billion, one hundred million, six hundred sixty-five thousand, six hundred thirty-two".