18664173011 has 4 divisors (see below), whose sum is σ = 20360916024. Its totient is φ = 16967430000.

The previous prime is 18664172999. The next prime is 18664173023. The reversal of 18664173011 is 11037146681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11037146681 = 11 ⋅1003376971.

It is an interprime number because it is at equal distance from previous prime (18664172999) and next prime (18664173023).

It is a cyclic number.

It is not a de Polignac number, because 18664173011 - 2²⁶ = 18597064147 is a prime.

It is a super-2 number, since 2×18664173011² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18664173071) 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, 848371490 + ... + 848371511.

It is an arithmetic number, because the mean of its divisors is an integer number (5090229006).

Almost surely, 2^18664173011 is an apocalyptic number.

18664173011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

18664173011 is a deficient number, since it is larger than the sum of its proper divisors (1696743013).

18664173011 is a wasteful number, since it uses less digits than its factorization.

18664173011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1696743012.

The product of its (nonzero) digits is 24192, while the sum is 38.

The spelling of 18664173011 in words is "eighteen billion, six hundred sixty-four million, one hundred seventy-three thousand, eleven".