2666021894 has 8 divisors (see below), whose sum is σ = 4003071168. Its totient is φ = 1331664840.

The previous prime is 2666021837. The next prime is 2666021899. The reversal of 2666021894 is 4981206662.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2666021899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 670577 + ... + 674540.

It is an arithmetic number, because the mean of its divisors is an integer number (500383896).

Almost surely, 2^2666021894 is an apocalyptic number.

2666021894 is a deficient number, since it is larger than the sum of its proper divisors (1337049274).

2666021894 is a wasteful number, since it uses less digits than its factorization.

2666021894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1346110.

The product of its (nonzero) digits is 248832, while the sum is 44.

The square root of 2666021894 is about 51633.5345875140. The cubic root of 2666021894 is about 1386.6107745927.

The spelling of 2666021894 in words is "two billion, six hundred sixty-six million, twenty-one thousand, eight hundred ninety-four".