18995266051 has 4 divisors (see below), whose sum is σ = 19076791032. Its totient is φ = 18913741072.

The previous prime is 18995266021. The next prime is 18995266067. The reversal of 18995266051 is 15066259981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15066259981 = 47 ⋅320558723.

It is a cyclic number.

It is not a de Polignac number, because 18995266051 - 2¹³ = 18995257859 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 18995266051.

It is not an unprimeable number, because it can be changed into a prime (18995266021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40762141 + ... + 40762606.

It is an arithmetic number, because the mean of its divisors is an integer number (4769197758).

Almost surely, 2^18995266051 is an apocalyptic number.

18995266051 is a deficient number, since it is larger than the sum of its proper divisors (81524981).

18995266051 is an equidigital number, since it uses as much as digits as its factorization.

18995266051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81524980.

The product of its (nonzero) digits is 1166400, while the sum is 52.

The spelling of 18995266051 in words is "eighteen billion, nine hundred ninety-five million, two hundred sixty-six thousand, fifty-one".