44521621065 has 48 divisors (see below), whose sum is σ = 80825921280. Its totient is φ = 22627904640.

The previous prime is 44521621057. The next prime is 44521621099. The reversal of 44521621065 is 56012612544.

44521621065 is a `hidden beast` number, since 4 + 4 + 5 + 21 + 621 + 0 + 6 + 5 = 666.

It is not a de Polignac number, because 44521621065 - 2³ = 44521621057 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 198460 + ... + 358370.

It is an arithmetic number, because the mean of its divisors is an integer number (1683873360).

Almost surely, 2^44521621065 is an apocalyptic number.

44521621065 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

44521621065 is a deficient number, since it is larger than the sum of its proper divisors (36304300215).

44521621065 is a wasteful number, since it uses less digits than its factorization.

44521621065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160214 (or 160211 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The spelling of 44521621065 in words is "forty-four billion, five hundred twenty-one million, six hundred twenty-one thousand, sixty-five".