74257881347691 has 12 divisors (see below), whose sum is σ = 107278788335368. Its totient is φ = 49497221539584.

The previous prime is 74257881347651. The next prime is 74257881347707. The reversal of 74257881347691 is 19674318875247.

It is a happy number.

74257881347691 is a `hidden beast` number, since 7 + 4 + 2 + 5 + 78 + 81 + 3 + 476 + 9 + 1 = 666.

It is not a de Polignac number, because 74257881347691 - 2⁷ = 74257881347563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74257881347651) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 669332470 + ... + 669443403.

Almost surely, 2^{74257881347691} is an apocalyptic number.

74257881347691 is a deficient number, since it is larger than the sum of its proper divisors (33020906987677).

74257881347691 is a wasteful number, since it uses less digits than its factorization.

74257881347691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1338782042 (or 1338782039 counting only the distinct ones).

The product of its digits is 568995840, while the sum is 72.

The spelling of 74257881347691 in words is "seventy-four trillion, two hundred fifty-seven billion, eight hundred eighty-one million, three hundred forty-seven thousand, six hundred ninety-one".