18266670387220 has 24 divisors (see below), whose sum is σ = 38360122605000. Its totient is φ = 7306646289792.

The previous prime is 18266670387193. The next prime is 18266670387247. The reversal of 18266670387220 is 2278307666281.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18266670387193) and next prime (18266670387247).

It can be written as a sum of positive squares in 4 ways, for example, as 1473295874436 + 16793374512784 = 1213794^2 + 4097972^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6623286 + ... + 8966674.

It is an arithmetic number, because the mean of its divisors is an integer number (1598338441875).

Almost surely, 2^{18266670387220} is an apocalyptic number.

18266670387220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18266670387220 is an abundant number, since it is smaller than the sum of its proper divisors (20093452217780).

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

18266670387220 is a wasteful number, since it uses less digits than its factorization.

18266670387220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2733147 (or 2733145 counting only the distinct ones).

The product of its (nonzero) digits is 16257024, while the sum is 58.

The spelling of 18266670387220 in words is "eighteen trillion, two hundred sixty-six billion, six hundred seventy million, three hundred eighty-seven thousand, two hundred twenty".