74395726829721 has 24 divisors (see below), whose sum is σ = 118198470093600. Its totient is φ = 45088319283480.

The previous prime is 74395726829629. The next prime is 74395726829729. The reversal of 74395726829721 is 12792862759347.

74395726829721 is a `hidden beast` number, since 7 + 4 + 3 + 9 + 57 + 268 + 297 + 21 = 666.

It is not a de Polignac number, because 74395726829721 - 2¹³ = 74395726821529 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 74395726829721.

It is not an unprimeable number, because it can be changed into a prime (74395726829729) 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, 3105244171 + ... + 3105268128.

It is an arithmetic number, because the mean of its divisors is an integer number (4924936253900).

Almost surely, 2^{74395726829721} is an apocalyptic number.

It is an amenable number.

74395726829721 is a deficient number, since it is larger than the sum of its proper divisors (43802743263879).

74395726829721 is a wasteful number, since it uses less digits than its factorization.

74395726829721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6210512338 (or 6210512313 counting only the distinct ones).

The product of its digits is 640120320, while the sum is 72.

The spelling of 74395726829721 in words is "seventy-four trillion, three hundred ninety-five billion, seven hundred twenty-six million, eight hundred twenty-nine thousand, seven hundred twenty-one".