2666581894 has 8 divisors (see below), whose sum is σ = 4000320288. Its totient is φ = 1333141800.

The previous prime is 2666581873. The next prime is 2666581909. The reversal of 2666581894 is 4981856662.

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

It is a super-2 number, since 2×2666581894² = 14221317994817254472, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50697 + ... + 88900.

It is an arithmetic number, because the mean of its divisors is an integer number (500040036).

Almost surely, 2^2666581894 is an apocalyptic number.

2666581894 is a deficient number, since it is larger than the sum of its proper divisors (1333738394).

2666581894 is a wasteful number, since it uses less digits than its factorization.

2666581894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149150.

The product of its digits is 4976640, while the sum is 55.

The square root of 2666581894 is about 51638.9571350933. The cubic root of 2666581894 is about 1386.7078540245.

The spelling of 2666581894 in words is "two billion, six hundred sixty-six million, five hundred eighty-one thousand, eight hundred ninety-four".