18231688861 has 8 divisors (see below), whose sum is σ = 18329146304. Its totient is φ = 18134487360.

The previous prime is 18231688847. The next prime is 18231688897. The reversal of 18231688861 is 16888613281.

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

It is a cyclic number.

It is not a de Polignac number, because 18231688861 - 2⁷ = 18231688733 is a prime.

It is a super-2 number, since 2×18231688861² (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 = 18231688799 and 18231688808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18231680861) 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, 79720 + ... + 206926.

It is an arithmetic number, because the mean of its divisors is an integer number (2291143288).

Almost surely, 2^18231688861 is an apocalyptic number.

It is an amenable number.

18231688861 is a deficient number, since it is larger than the sum of its proper divisors (97457443).

18231688861 is a wasteful number, since it uses less digits than its factorization.

18231688861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127971.

The product of its digits is 884736, while the sum is 52.

The spelling of 18231688861 in words is "eighteen billion, two hundred thirty-one million, six hundred eighty-eight thousand, eight hundred sixty-one".