74521143585 has 96 divisors (see below), whose sum is σ = 156063628800. Its totient is φ = 33635347200.

The previous prime is 74521143503. The next prime is 74521143637. The reversal of 74521143585 is 58534112547.

74521143585 is a `hidden beast` number, since 7 + 4 + 5 + 21 + 1 + 43 + 585 = 666.

It is not a de Polignac number, because 74521143585 - 2⁷ = 74521143457 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 74521143585.

It is an unprimeable number.

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 95 ways as a sum of consecutive naturals, for example, 451285 + ... + 593885.

It is an arithmetic number, because the mean of its divisors is an integer number (1625662800).

Almost surely, 2^74521143585 is an apocalyptic number.

It is an amenable number.

74521143585 is an abundant number, since it is smaller than the sum of its proper divisors (81542485215).

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

74521143585 is a wasteful number, since it uses less digits than its factorization.

74521143585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142708 (or 142695 counting only the distinct ones).

The product of its digits is 672000, while the sum is 45.

The spelling of 74521143585 in words is "seventy-four billion, five hundred twenty-one million, one hundred forty-three thousand, five hundred eighty-five".