74639493647 has 4 divisors (see below), whose sum is σ = 77213269320. Its totient is φ = 72065717976.

The previous prime is 74639493571. The next prime is 74639493653.

74639493647 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 74639493647 - 2²⁰ = 74638445071 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 74639493647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74639493347) 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, 1286887793 + ... + 1286887850.

It is an arithmetic number, because the mean of its divisors is an integer number (19303317330).

Almost surely, 2^74639493647 is an apocalyptic number.

74639493647 is a deficient number, since it is larger than the sum of its proper divisors (2573775673).

74639493647 is a wasteful number, since it uses less digits than its factorization.

74639493647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2573775672.

The product of its digits is 82301184, while the sum is 62.

The spelling of 74639493647 in words is "seventy-four billion, six hundred thirty-nine million, four hundred ninety-three thousand, six hundred forty-seven".