61666333636 has 12 divisors (see below), whose sum is σ = 107920285200. Its totient is φ = 30831966440.

The previous prime is 61666333627. The next prime is 61666333667. The reversal of 61666333636 is 63633366616.

It is a self number, because there is not a number n which added to its sum of digits gives 61666333636.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 179086 + ... + 394213.

It is an arithmetic number, because the mean of its divisors is an integer number (8993357100).

Almost surely, 2^61666333636 is an apocalyptic number.

It is an amenable number.

61666333636 is a deficient number, since it is larger than the sum of its proper divisors (46253951564).

61666333636 is a wasteful number, since it uses less digits than its factorization.

61666333636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 600194 (or 600192 counting only the distinct ones).

The product of its digits is 3779136, while the sum is 49.

The spelling of 61666333636 in words is "sixty-one billion, six hundred sixty-six million, three hundred thirty-three thousand, six hundred thirty-six".