18866801 has 2 divisors, whose sum is σ = 18866802. Its totient is φ = 18866800.

The previous prime is 18866797. The next prime is 18866803. The reversal of 18866801 is 10866881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12496225 + 6370576 = 3535^2 + 2524^2 .

It is a cyclic number.

It is not a de Polignac number, because 18866801 - 2² = 18866797 is a prime.

Together with 18866803, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18866803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9433400 + 9433401.

It is an arithmetic number, because the mean of its divisors is an integer number (9433401).

Almost surely, 2^18866801 is an apocalyptic number.

It is an amenable number.

18866801 is a deficient number, since it is larger than the sum of its proper divisors (1).

18866801 is an equidigital number, since it uses as much as digits as its factorization.

18866801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18432, while the sum is 38.

The square root of 18866801 is about 4343.5930978857. The cubic root of 18866801 is about 266.2151433720.

The spelling of 18866801 in words is "eighteen million, eight hundred sixty-six thousand, eight hundred one".