2661316654 has 4 divisors (see below), whose sum is σ = 3991974984. Its totient is φ = 1330658326.

The previous prime is 2661316639. The next prime is 2661316661. The reversal of 2661316654 is 4566131662.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665329162 + ... + 665329165.

It is an arithmetic number, because the mean of its divisors is an integer number (997993746).

Almost surely, 2^2661316654 is an apocalyptic number.

2661316654 is a deficient number, since it is larger than the sum of its proper divisors (1330658330).

2661316654 is a wasteful number, since it uses less digits than its factorization.

2661316654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1330658329.

The product of its digits is 155520, while the sum is 40.

The square root of 2661316654 is about 51587.9506667982. The cubic root of 2661316654 is about 1385.7945549269.

The spelling of 2661316654 in words is "two billion, six hundred sixty-one million, three hundred sixteen thousand, six hundred fifty-four".