2661256516166 has 8 divisors (see below), whose sum is σ = 4006614977184. Its totient is φ = 1325718190440.

The previous prime is 2661256516129. The next prime is 2661256516169. The reversal of 2661256516166 is 6616156521662.

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 (2661256516169) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2455033145 + ... + 2455034228.

It is an arithmetic number, because the mean of its divisors is an integer number (500826872148).

Almost surely, 2^{2661256516166} is an apocalyptic number.

2661256516166 is a deficient number, since it is larger than the sum of its proper divisors (1345358461018).

2661256516166 is a wasteful number, since it uses less digits than its factorization.

2661256516166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4910067646.

The product of its digits is 4665600, while the sum is 53.

The spelling of 2661256516166 in words is "two trillion, six hundred sixty-one billion, two hundred fifty-six million, five hundred sixteen thousand, one hundred sixty-six".