74987659891 has 4 divisors (see below), whose sum is σ = 74990811352. Its totient is φ = 74984508432.

The previous prime is 74987659843. The next prime is 74987659909. The reversal of 74987659891 is 19895678947.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 74987659891 - 2³¹ = 72840176243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (74987659811) 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, 1539765 + ... + 1587718.

It is an arithmetic number, because the mean of its divisors is an integer number (18747702838).

Almost surely, 2^74987659891 is an apocalyptic number.

74987659891 is a deficient number, since it is larger than the sum of its proper divisors (3151461).

74987659891 is a wasteful number, since it uses less digits than its factorization.

74987659891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3151460.

The product of its digits is 274337280, while the sum is 73.

The spelling of 74987659891 in words is "seventy-four billion, nine hundred eighty-seven million, six hundred fifty-nine thousand, eight hundred ninety-one".