18981666869 has 8 divisors (see below), whose sum is σ = 20708421312. Its totient is φ = 17255103840.

The previous prime is 18981666833. The next prime is 18981666923. The reversal of 18981666869 is 96866618981.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18981666869 is a prime.

It is a super-2 number, since 2×18981666869² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18981666799 and 18981666808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18981666169) 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, 229337 + ... + 300929.

It is an arithmetic number, because the mean of its divisors is an integer number (2588552664).

Almost surely, 2^18981666869 is an apocalyptic number.

It is an amenable number.

18981666869 is a deficient number, since it is larger than the sum of its proper divisors (1726754443).

18981666869 is a wasteful number, since it uses less digits than its factorization.

18981666869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95707.

The product of its digits is 53747712, while the sum is 68.

The spelling of 18981666869 in words is "eighteen billion, nine hundred eighty-one million, six hundred sixty-six thousand, eight hundred sixty-nine".