18686238761 has 8 divisors (see below), whose sum is σ = 19183363584. Its totient is φ = 18191083680.

The previous prime is 18686238757. The next prime is 18686238817. The reversal of 18686238761 is 16783268681.

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 18686238761 - 2² = 18686238757 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18686238697 and 18686238706.

It is not an unprimeable number, because it can be changed into a prime (18686235761) 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, 473201 + ... + 511166.

It is an arithmetic number, because the mean of its divisors is an integer number (2397920448).

Almost surely, 2^18686238761 is an apocalyptic number.

It is an amenable number.

18686238761 is a deficient number, since it is larger than the sum of its proper divisors (497124823).

18686238761 is an equidigital number, since it uses as much as digits as its factorization.

18686238761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 984871.

The product of its digits is 4644864, while the sum is 56.

The spelling of 18686238761 in words is "eighteen billion, six hundred eighty-six million, two hundred thirty-eight thousand, seven hundred sixty-one".