18168662207 has 4 divisors (see below), whose sum is σ = 18555229536. Its totient is φ = 17782094880.

The previous prime is 18168662189. The next prime is 18168662219. The reversal of 18168662207 is 70226686181.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18168662207 - 2²⁰ = 18167613631 is a prime.

It is a super-2 number, since 2×18168662207² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (47), and also a Moran number because the ratio is a prime number: 386567281 = 18168662207 / (1 + 8 + 1 + 6 + 8 + 6 + 6 + 2 + 2 + 0 + 7).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18168662507) 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, 193283594 + ... + 193283687.

It is an arithmetic number, because the mean of its divisors is an integer number (4638807384).

Almost surely, 2^18168662207 is an apocalyptic number.

18168662207 is a deficient number, since it is larger than the sum of its proper divisors (386567329).

18168662207 is an equidigital number, since it uses as much as digits as its factorization.

18168662207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386567328.

The product of its (nonzero) digits is 387072, while the sum is 47.

The spelling of 18168662207 in words is "eighteen billion, one hundred sixty-eight million, six hundred sixty-two thousand, two hundred seven".