1665555720364 has 6 divisors (see below), whose sum is σ = 2914722510644. Its totient is φ = 832777860180.

The previous prime is 1665555720341. The next prime is 1665555720377. The reversal of 1665555720364 is 4630275555661.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 208194465042 + ... + 208194465049.

Almost surely, 2^{1665555720364} is an apocalyptic number.

It is an amenable number.

1665555720364 is a deficient number, since it is larger than the sum of its proper divisors (1249166790280).

1665555720364 is a wasteful number, since it uses less digits than its factorization.

1665555720364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416388930095 (or 416388930093 counting only the distinct ones).

The product of its (nonzero) digits is 22680000, while the sum is 55.

The spelling of 1665555720364 in words is "one trillion, six hundred sixty-five billion, five hundred fifty-five million, seven hundred twenty thousand, three hundred sixty-four".