74278317999 has 4 divisors (see below), whose sum is σ = 99037757336. Its totient is φ = 49518878664.

The previous prime is 74278317881. The next prime is 74278318043. The reversal of 74278317999 is 99971387247.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99971387247 = 3 ⋅33323795749.

It is not a de Polignac number, because 74278317999 - 2²¹ = 74276220847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74278327999) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12379719664 + ... + 12379719669.

It is an arithmetic number, because the mean of its divisors is an integer number (24759439334).

Almost surely, 2^74278317999 is an apocalyptic number.

74278317999 is a deficient number, since it is larger than the sum of its proper divisors (24759439337).

74278317999 is a wasteful number, since it uses less digits than its factorization.

74278317999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24759439336.

The product of its digits is 48009024, while the sum is 66.

The spelling of 74278317999 in words is "seventy-four billion, two hundred seventy-eight million, three hundred seventeen thousand, nine hundred ninety-nine".