2666436661 has 16 divisors (see below), whose sum is σ = 3071064960. Its totient is φ = 2267778240.

The previous prime is 2666436637. The next prime is 2666436673. The reversal of 2666436661 is 1666346662.

It is not a de Polignac number, because 2666436661 - 2⁵ = 2666436629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2666436691) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1118691 + ... + 1121071.

It is an arithmetic number, because the mean of its divisors is an integer number (191941560).

Almost surely, 2^2666436661 is an apocalyptic number.

It is an amenable number.

2666436661 is a deficient number, since it is larger than the sum of its proper divisors (404628299).

2666436661 is a wasteful number, since it uses less digits than its factorization.

2666436661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3564.

The product of its digits is 1119744, while the sum is 46.

The square root of 2666436661 is about 51637.5508811175. The cubic root of 2666436661 is about 1386.6826782994.

The spelling of 2666436661 in words is "two billion, six hundred sixty-six million, four hundred thirty-six thousand, six hundred sixty-one".