74451756321 has 12 divisors (see below), whose sum is σ = 107545803300. Its totient is φ = 49632483840.

The previous prime is 74451756319. The next prime is 74451756331. The reversal of 74451756321 is 12365715447.

74451756321 is a `hidden beast` number, since 7 + 4 + 4 + 5 + 1 + 7 + 5 + 632 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 111007296 + 74340749025 = 10536^2 + 272655^2 .

It is not a de Polignac number, because 74451756321 - 2¹ = 74451756319 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (74451756311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 85105 + ... + 395153.

It is an arithmetic number, because the mean of its divisors is an integer number (8962150275).

Almost surely, 2^74451756321 is an apocalyptic number.

It is an amenable number.

74451756321 is a deficient number, since it is larger than the sum of its proper divisors (33094046979).

74451756321 is a wasteful number, since it uses less digits than its factorization.

74451756321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336736 (or 336733 counting only the distinct ones).

The product of its digits is 705600, while the sum is 45.

The spelling of 74451756321 in words is "seventy-four billion, four hundred fifty-one million, seven hundred fifty-six thousand, three hundred twenty-one".