18868776817 has 16 divisors (see below), whose sum is σ = 21194971200. Its totient is φ = 16646783040.

The previous prime is 18868776803. The next prime is 18868776841. The reversal of 18868776817 is 71867786881.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18868776817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18868776847) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98734 + ... + 217912.

It is an arithmetic number, because the mean of its divisors is an integer number (1324685700).

Almost surely, 2^18868776817 is an apocalyptic number.

It is an amenable number.

18868776817 is a deficient number, since it is larger than the sum of its proper divisors (2326194383).

18868776817 is a wasteful number, since it uses less digits than its factorization.

18868776817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119616.

The product of its digits is 50577408, while the sum is 67.

The spelling of 18868776817 in words is "eighteen billion, eight hundred sixty-eight million, seven hundred seventy-six thousand, eight hundred seventeen".