18866909121 has 8 divisors (see below), whose sum is σ = 25156549440. Its totient is φ = 12577604112.

The previous prime is 18866909107. The next prime is 18866909129. The reversal of 18866909121 is 12190966881.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18866909121 - 2³¹ = 16719425473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18866909129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 114495 + ... + 225483.

It is an arithmetic number, because the mean of its divisors is an integer number (3144568680).

Almost surely, 2^18866909121 is an apocalyptic number.

It is an amenable number.

18866909121 is a deficient number, since it is larger than the sum of its proper divisors (6289640319).

18866909121 is a wasteful number, since it uses less digits than its factorization.

18866909121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167655.

The product of its (nonzero) digits is 373248, while the sum is 51.

The spelling of 18866909121 in words is "eighteen billion, eight hundred sixty-six million, nine hundred nine thousand, one hundred twenty-one".