18166120810 has 32 divisors (see below), whose sum is σ = 33456877632. Its totient is φ = 7099896960.

The previous prime is 18166120801. The next prime is 18166120853. The reversal of 18166120810 is 1802166181.

It is a happy number.

It is a super-2 number, since 2×18166120810² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38176 + ... + 194395.

It is an arithmetic number, because the mean of its divisors is an integer number (1045527426).

Almost surely, 2^18166120810 is an apocalyptic number.

18166120810 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18166120810 is a deficient number, since it is larger than the sum of its proper divisors (15290756822).

18166120810 is a wasteful number, since it uses less digits than its factorization.

18166120810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232758.

The product of its (nonzero) digits is 4608, while the sum is 34.

Adding to 18166120810 its reverse (1802166181), we get a palindrome (19968286991).

The spelling of 18166120810 in words is "eighteen billion, one hundred sixty-six million, one hundred twenty thousand, eight hundred ten".