74117451985 has 8 divisors (see below), whose sum is σ = 89432329896. Its totient is φ = 58966369920.

The previous prime is 74117451983. The next prime is 74117451997. The reversal of 74117451985 is 58915471147.

It can be written as a sum of positive squares in 4 ways, for example, as 2636617104 + 71480834881 = 51348^2 + 267359^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 74117451985 - 2¹ = 74117451983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74117451983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40947964 + ... + 40949773.

It is an arithmetic number, because the mean of its divisors is an integer number (11179041237).

Almost surely, 2^74117451985 is an apocalyptic number.

It is an amenable number.

74117451985 is a deficient number, since it is larger than the sum of its proper divisors (15314877911).

74117451985 is a wasteful number, since it uses less digits than its factorization.

74117451985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81897923.

The product of its digits is 1411200, while the sum is 52.

The spelling of 74117451985 in words is "seventy-four billion, one hundred seventeen million, four hundred fifty-one thousand, nine hundred eighty-five".