77042987859 has 4 divisors (see below), whose sum is σ = 102723983816. Its totient is φ = 51361991904.

The previous prime is 77042987851. The next prime is 77042987869. The reversal of 77042987859 is 95878924077.

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

It is not a de Polignac number, because 77042987859 - 2³ = 77042987851 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77042987859.

It is not an unprimeable number, because it can be changed into a prime (77042987851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12840497974 + ... + 12840497979.

It is an arithmetic number, because the mean of its divisors is an integer number (25680995954).

Almost surely, 2^77042987859 is an apocalyptic number.

77042987859 is a deficient number, since it is larger than the sum of its proper divisors (25680995957).

77042987859 is a wasteful number, since it uses less digits than its factorization.

77042987859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25680995956.

The product of its (nonzero) digits is 71124480, while the sum is 66.

The spelling of 77042987859 in words is "seventy-seven billion, forty-two million, nine hundred eighty-seven thousand, eight hundred fifty-nine".