18654125866 has 4 divisors (see below), whose sum is σ = 27981188802. Its totient is φ = 9327062932.

The previous prime is 18654125803. The next prime is 18654125939. The reversal of 18654125866 is 66852145681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66852145681 = 1051 ⋅63608131.

It can be written as a sum of positive squares in only one way, i.e., 16481167641 + 2172958225 = 128379^2 + 46615^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4663531465 + ... + 4663531468.

Almost surely, 2^18654125866 is an apocalyptic number.

18654125866 is a deficient number, since it is larger than the sum of its proper divisors (9327062936).

18654125866 is an equidigital number, since it uses as much as digits as its factorization.

18654125866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9327062935.

The product of its digits is 2764800, while the sum is 52.

The spelling of 18654125866 in words is "eighteen billion, six hundred fifty-four million, one hundred twenty-five thousand, eight hundred sixty-six".