445663521666 has 48 divisors (see below), whose sum is σ = 1092400833888. Its totient is φ = 135049550400.

The previous prime is 445663521613. The next prime is 445663521731. The reversal of 445663521666 is 666125366544.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 41676615 + ... + 41687306.

It is an arithmetic number, because the mean of its divisors is an integer number (22758350706).

Almost surely, 2^445663521666 is an apocalyptic number.

445663521666 is an abundant number, since it is smaller than the sum of its proper divisors (646737312222).

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

445663521666 is a wasteful number, since it uses less digits than its factorization.

445663521666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83363949 (or 83363937 counting only the distinct ones).

The product of its digits is 18662400, while the sum is 54.

The spelling of 445663521666 in words is "four hundred forty-five billion, six hundred sixty-three million, five hundred twenty-one thousand, six hundred sixty-six".