2666187738 has 112 divisors (see below), whose sum is σ = 6405854400. Its totient is φ = 830319336.

The previous prime is 2666187721. The next prime is 2666187743. The reversal of 2666187738 is 8377816662.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 62004345 + ... + 62004387.

Almost surely, 2^2666187738 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2666187738, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3202927200).

2666187738 is an abundant number, since it is smaller than the sum of its proper divisors (3739666662).

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

2666187738 is an frugal number, since it uses more digits than its factorization.

2666187738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172 (or 71 counting only the distinct ones).

The product of its digits is 4064256, while the sum is 54.

The square root of 2666187738 is about 51635.1405343299. The cubic root of 2666187738 is about 1386.6395260832.

The spelling of 2666187738 in words is "two billion, six hundred sixty-six million, one hundred eighty-seven thousand, seven hundred thirty-eight".