201665445440 has 56 divisors (see below), whose sum is σ = 491383685760. Its totient is φ = 78790215168.

The previous prime is 201665445413. The next prime is 201665445451. The reversal of 201665445440 is 44544566102.

201665445440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 7 ways as a sum of consecutive naturals, for example, 7314200 + ... + 7341719.

Almost surely, 2^201665445440 is an apocalyptic number.

201665445440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201665445440 is an abundant number, since it is smaller than the sum of its proper divisors (289718240320).

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

201665445440 is a wasteful number, since it uses less digits than its factorization.

201665445440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14655979 (or 14655969 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 41.

The spelling of 201665445440 in words is "two hundred one billion, six hundred sixty-five million, four hundred forty-five thousand, four hundred forty".