76744524221 has 4 divisors (see below), whose sum is σ = 76745219232. Its totient is φ = 76743829212.

The previous prime is 76744524191. The next prime is 76744524257. The reversal of 76744524221 is 12242544767.

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: 12242544767 = 15277 ⋅801371.

It is a cyclic number.

It is not a de Polignac number, because 76744524221 - 2¹⁰ = 76744523197 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 (76744524121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140945 + ... + 416358.

It is an arithmetic number, because the mean of its divisors is an integer number (19186304808).

Almost surely, 2^76744524221 is an apocalyptic number.

It is an amenable number.

76744524221 is a deficient number, since it is larger than the sum of its proper divisors (695011).

76744524221 is a wasteful number, since it uses less digits than its factorization.

76744524221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 695010.

The product of its digits is 752640, while the sum is 44.

The spelling of 76744524221 in words is "seventy-six billion, seven hundred forty-four million, five hundred twenty-four thousand, two hundred twenty-one".