18446787877 has 4 divisors (see below), whose sum is σ = 21082043296. Its totient is φ = 15811532460.

The previous prime is 18446787859. The next prime is 18446787883. The reversal of 18446787877 is 77878764481.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18446787877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18446787817) 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, 1317627699 + ... + 1317627712.

It is an arithmetic number, because the mean of its divisors is an integer number (5270510824).

Almost surely, 2^18446787877 is an apocalyptic number.

It is an amenable number.

18446787877 is a deficient number, since it is larger than the sum of its proper divisors (2635255419).

18446787877 is an equidigital number, since it uses as much as digits as its factorization.

18446787877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2635255418.

The product of its digits is 118013952, while the sum is 67.

The spelling of 18446787877 in words is "eighteen billion, four hundred forty-six million, seven hundred eighty-seven thousand, eight hundred seventy-seven".