18200768906 has 4 divisors (see below), whose sum is σ = 27301153362. Its totient is φ = 9100384452.

The previous prime is 18200768903. The next prime is 18200768947. The reversal of 18200768906 is 60986700281.

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

It can be written as a sum of positive squares in only one way, i.e., 18200438281 + 330625 = 134909^2 + 575^2 .

It is a super-3 number, since 3×18200768906³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (18200768903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4550192225 + ... + 4550192228.

Almost surely, 2^18200768906 is an apocalyptic number.

18200768906 is a deficient number, since it is larger than the sum of its proper divisors (9100384456).

18200768906 is an equidigital number, since it uses as much as digits as its factorization.

18200768906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9100384455.

The product of its (nonzero) digits is 290304, while the sum is 47.

The spelling of 18200768906 in words is "eighteen billion, two hundred million, seven hundred sixty-eight thousand, nine hundred six".