74445903621 has 6 divisors (see below), whose sum is σ = 107532971910. Its totient is φ = 49630602408.

The previous prime is 74445903619. The next prime is 74445903661. The reversal of 74445903621 is 12630954447.

74445903621 is a `hidden beast` number, since 7 + 4 + 4 + 4 + 590 + 36 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 46410084900 + 28035818721 = 215430^2 + 167439^2 .

It is not a de Polignac number, because 74445903621 - 2¹ = 74445903619 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74445903611) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4135883526 + ... + 4135883543.

It is an arithmetic number, because the mean of its divisors is an integer number (17922161985).

Almost surely, 2^74445903621 is an apocalyptic number.

It is an amenable number.

74445903621 is a deficient number, since it is larger than the sum of its proper divisors (33087068289).

74445903621 is a wasteful number, since it uses less digits than its factorization.

74445903621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8271767075 (or 8271767072 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 45.

The spelling of 74445903621 in words is "seventy-four billion, four hundred forty-five million, nine hundred three thousand, six hundred twenty-one".