77848999891 has 16 divisors (see below), whose sum is σ = 86566332160. Its totient is φ = 69522831360.

The previous prime is 77848999889. The next prime is 77848999903. The reversal of 77848999891 is 19899984877.

It is a cyclic number.

It is not a de Polignac number, because 77848999891 - 2¹ = 77848999889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77848999871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1503115 + ... + 1554043.

It is an arithmetic number, because the mean of its divisors is an integer number (5410395760).

Almost surely, 2^77848999891 is an apocalyptic number.

77848999891 is a deficient number, since it is larger than the sum of its proper divisors (8717332269).

77848999891 is a wasteful number, since it uses less digits than its factorization.

77848999891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54766.

The product of its digits is 658409472, while the sum is 79.

The spelling of 77848999891 in words is "seventy-seven billion, eight hundred forty-eight million, nine hundred ninety-nine thousand, eight hundred ninety-one".