445192989921 has 48 divisors (see below), whose sum is σ = 682689047040. Its totient is φ = 279116167680.

The previous prime is 445192989907. The next prime is 445192989947. The reversal of 445192989921 is 129989291544.

445192989921 is a `hidden beast` number, since 4 + 4 + 519 + 2 + 9 + 8 + 99 + 21 = 666.

It is not a de Polignac number, because 445192989921 - 2¹³ = 445192981729 is a prime.

It is not an unprimeable number, because it can be changed into a prime (445192989961) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2269225 + ... + 2457593.

It is an arithmetic number, because the mean of its divisors is an integer number (14222688480).

Almost surely, 2^445192989921 is an apocalyptic number.

It is an amenable number.

445192989921 is a deficient number, since it is larger than the sum of its proper divisors (237496057119).

445192989921 is a wasteful number, since it uses less digits than its factorization.

445192989921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188646 (or 188643 counting only the distinct ones).

The product of its digits is 16796160, while the sum is 63.

The spelling of 445192989921 in words is "four hundred forty-five billion, one hundred ninety-two million, nine hundred eighty-nine thousand, nine hundred twenty-one".