66619673631684 has 120 divisors (see below), whose sum is σ = 177484837523840. Its totient is φ = 21785808268224.

The previous prime is 66619673631673. The next prime is 66619673631733. The reversal of 66619673631684 is 48613637691666.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 4270402 + ... + 12307545.

Almost surely, 2^{66619673631684} is an apocalyptic number.

It is an amenable number.

66619673631684 is an abundant number, since it is smaller than the sum of its proper divisors (110865163892156).

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

66619673631684 is a wasteful number, since it uses less digits than its factorization.

66619673631684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16578199 (or 16578188 counting only the distinct ones).

The product of its digits is 846526464, while the sum is 72.

The spelling of 66619673631684 in words is "sixty-six trillion, six hundred nineteen billion, six hundred seventy-three million, six hundred thirty-one thousand, six hundred eighty-four".