74978317791 has 32 divisors (see below), whose sum is σ = 119642281920. Its totient is φ = 46133269632.

The previous prime is 74978317789. The next prime is 74978317793. The reversal of 74978317791 is 19771387947.

It is an interprime number because it is at equal distance from previous prime (74978317789) and next prime (74978317793).

It is not a de Polignac number, because 74978317791 - 2¹ = 74978317789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74978317793) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2996665 + ... + 3021581.

It is an arithmetic number, because the mean of its divisors is an integer number (3738821310).

Almost surely, 2^74978317791 is an apocalyptic number.

74978317791 is a deficient number, since it is larger than the sum of its proper divisors (44663964129).

74978317791 is a wasteful number, since it uses less digits than its factorization.

74978317791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33512 (or 33506 counting only the distinct ones).

The product of its digits is 18670176, while the sum is 63.

The spelling of 74978317791 in words is "seventy-four billion, nine hundred seventy-eight million, three hundred seventeen thousand, seven hundred ninety-one".