18351666684 has 36 divisors (see below), whose sum is σ = 49957316136. Its totient is φ = 5646666528.

The previous prime is 18351666679. The next prime is 18351666689. The reversal of 18351666684 is 48666615381.

It is an interprime number because it is at equal distance from previous prime (18351666679) and next prime (18351666689).

It is a tau number, because it is divible by the number of its divisors (36).

It is a self number, because there is not a number n which added to its sum of digits gives 18351666684.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18351666689) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19606014 + ... + 19606949.

It is an arithmetic number, because the mean of its divisors is an integer number (1387703226).

Almost surely, 2^18351666684 is an apocalyptic number.

It is an amenable number.

18351666684 is an abundant number, since it is smaller than the sum of its proper divisors (31605649452).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18351666684 is a wasteful number, since it uses less digits than its factorization.

18351666684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39212986 (or 39212981 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 54.

It can be divided in two parts, 18351 and 666684, that added together give a triangular number (685035 = T₁₁₇₀).

The spelling of 18351666684 in words is "eighteen billion, three hundred fifty-one million, six hundred sixty-six thousand, six hundred eighty-four".