74400521745 has 24 divisors (see below), whose sum is σ = 130846540608. Its totient is φ = 36072979360.

The previous prime is 74400521719. The next prime is 74400521749. The reversal of 74400521745 is 54712500447.

It is not a de Polignac number, because 74400521745 - 2¹⁰ = 74400520721 is a prime.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (74400521749) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20494197 + ... + 20497826.

It is an arithmetic number, because the mean of its divisors is an integer number (5451939192).

Almost surely, 2^74400521745 is an apocalyptic number.

It is an amenable number.

74400521745 is a deficient number, since it is larger than the sum of its proper divisors (56446018863).

74400521745 is a wasteful number, since it uses less digits than its factorization.

74400521745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40992053 (or 40992042 counting only the distinct ones).

The product of its (nonzero) digits is 156800, while the sum is 39.

The spelling of 74400521745 in words is "seventy-four billion, four hundred million, five hundred twenty-one thousand, seven hundred forty-five".