2661654566 has 8 divisors (see below), whose sum is σ = 4021205160. Its totient is φ = 1321252848.

The previous prime is 2661654511. The next prime is 2661654587. The reversal of 2661654566 is 6654561662.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2661654566.

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, 4786871 + ... + 4787426.

It is an arithmetic number, because the mean of its divisors is an integer number (502650645).

Almost surely, 2^2661654566 is an apocalyptic number.

2661654566 is a deficient number, since it is larger than the sum of its proper divisors (1359550594).

2661654566 is a wasteful number, since it uses less digits than its factorization.

2661654566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9574438.

The product of its digits is 1555200, while the sum is 47.

The square root of 2661654566 is about 51591.2256687123. The cubic root of 2661654566 is about 1385.8532046923.

The spelling of 2661654566 in words is "two billion, six hundred sixty-one million, six hundred fifty-four thousand, five hundred sixty-six".