74468397521 has 4 divisors (see below), whose sum is σ = 85106740032. Its totient is φ = 63830055012.

The previous prime is 74468397481. The next prime is 74468397559. The reversal of 74468397521 is 12579386447.

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 an emirpimes, since its reverse is a distinct semiprime: 12579386447 = 71 ⋅177174457.

It is a cyclic number.

It is not a de Polignac number, because 74468397521 - 2¹⁸ = 74468135377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74468397581) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 5319171245 + ... + 5319171258.

It is an arithmetic number, because the mean of its divisors is an integer number (21276685008).

Almost surely, 2^74468397521 is an apocalyptic number.

It is an amenable number.

74468397521 is a deficient number, since it is larger than the sum of its proper divisors (10638342511).

74468397521 is a wasteful number, since it uses less digits than its factorization.

74468397521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10638342510.

The product of its digits is 10160640, while the sum is 56.

The spelling of 74468397521 in words is "seventy-four billion, four hundred sixty-eight million, three hundred ninety-seven thousand, five hundred twenty-one".