74531579999 has 4 divisors (see below), whose sum is σ = 76545947064. Its totient is φ = 72517212936.

The previous prime is 74531579981. The next prime is 74531580043. The reversal of 74531579999 is 99997513547.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99997513547 = 126311 ⋅791677.

It is a cyclic number.

It is not a de Polignac number, because 74531579999 - 2³² = 70236612703 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74531579929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1007183477 + ... + 1007183550.

It is an arithmetic number, because the mean of its divisors is an integer number (19136486766).

Almost surely, 2^74531579999 is an apocalyptic number.

74531579999 is a deficient number, since it is larger than the sum of its proper divisors (2014367065).

74531579999 is a wasteful number, since it uses less digits than its factorization.

74531579999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2014367064.

The product of its digits is 96446700, while the sum is 68.

The spelling of 74531579999 in words is "seventy-four billion, five hundred thirty-one million, five hundred seventy-nine thousand, nine hundred ninety-nine".