18766606388544 has 280 divisors, whose sum is σ = 63928535518848. Its totient is φ = 5332261985280.

The previous prime is 18766606388449. The next prime is 18766606388549. The reversal of 18766606388544 is 44588360666781.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18766606388549) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 5139517 + ... + 7996739.

Almost surely, 2^{18766606388544} is an apocalyptic number.

18766606388544 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18766606388544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31964267759424).

18766606388544 is an abundant number, since it is smaller than the sum of its proper divisors (45161929130304).

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

18766606388544 is a wasteful number, since it uses less digits than its factorization.

18766606388544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2857435 (or 2857416 counting only the distinct ones).

The product of its (nonzero) digits is 1114767360, while the sum is 72.

The spelling of 18766606388544 in words is "eighteen trillion, seven hundred sixty-six billion, six hundred six million, three hundred eighty-eight thousand, five hundred forty-four".