74766987257 has 4 divisors (see below), whose sum is σ = 74767639716. Its totient is φ = 74766334800.

The previous prime is 74766987247. The next prime is 74766987311. The reversal of 74766987257 is 75278966747.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 12972982201 + 61794005056 = 113899^2 + 248584^2 .

It is a cyclic number.

It is not a de Polignac number, because 74766987257 - 2²² = 74762792953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74766987227) 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, 103778 + ... + 400379.

It is an arithmetic number, because the mean of its divisors is an integer number (18691909929).

Almost surely, 2^74766987257 is an apocalyptic number.

It is an amenable number.

74766987257 is a deficient number, since it is larger than the sum of its proper divisors (652459).

74766987257 is a wasteful number, since it uses less digits than its factorization.

74766987257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652458.

The product of its digits is 248935680, while the sum is 68.

The spelling of 74766987257 in words is "seventy-four billion, seven hundred sixty-six million, nine hundred eighty-seven thousand, two hundred fifty-seven".