74643788449 has 4 divisors (see below), whose sum is σ = 74644472880. Its totient is φ = 74643104020.

The previous prime is 74643788441. The next prime is 74643788477. The reversal of 74643788449 is 94488734647.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 94488734647 = 191 ⋅494705417.

It is a cyclic number.

It is not a de Polignac number, because 74643788449 - 2³ = 74643788441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74643788441) 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, 138007 + ... + 410284.

It is an arithmetic number, because the mean of its divisors is an integer number (18661118220).

Almost surely, 2^74643788449 is an apocalyptic number.

It is an amenable number.

74643788449 is a deficient number, since it is larger than the sum of its proper divisors (684431).

74643788449 is a wasteful number, since it uses less digits than its factorization.

74643788449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 684430.

The product of its digits is 130056192, while the sum is 64.

The spelling of 74643788449 in words is "seventy-four billion, six hundred forty-three million, seven hundred eighty-eight thousand, four hundred forty-nine".