74523721555 has 4 divisors (see below), whose sum is σ = 89428465872. Its totient is φ = 59618977240.

The previous prime is 74523721543. The next prime is 74523721577. The reversal of 74523721555 is 55512732547.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55512732547 = 60961 ⋅910627.

It is not a de Polignac number, because 74523721555 - 2⁷ = 74523721427 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7452372151 + ... + 7452372160.

It is an arithmetic number, because the mean of its divisors is an integer number (22357116468).

Almost surely, 2^74523721555 is an apocalyptic number.

74523721555 is a deficient number, since it is larger than the sum of its proper divisors (14904744317).

74523721555 is a wasteful number, since it uses less digits than its factorization.

74523721555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14904744316.

The product of its digits is 1470000, while the sum is 46.

The spelling of 74523721555 in words is "seventy-four billion, five hundred twenty-three million, seven hundred twenty-one thousand, five hundred fifty-five".