18511056617 has 4 divisors (see below), whose sum is σ = 18521168256. Its totient is φ = 18500944980.

The previous prime is 18511056569. The next prime is 18511056637. The reversal of 18511056617 is 71665011581.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 71665011581 = 233 ⋅307575157.

It is a cyclic number.

It is not a de Polignac number, because 18511056617 - 2¹⁰ = 18511055593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18511056637) 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, 5053073 + ... + 5056734.

It is an arithmetic number, because the mean of its divisors is an integer number (4630292064).

Almost surely, 2^18511056617 is an apocalyptic number.

It is an amenable number.

18511056617 is a deficient number, since it is larger than the sum of its proper divisors (10111639).

18511056617 is a wasteful number, since it uses less digits than its factorization.

18511056617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10111638.

The product of its (nonzero) digits is 50400, while the sum is 41.

The spelling of 18511056617 in words is "eighteen billion, five hundred eleven million, fifty-six thousand, six hundred seventeen".