2666397617 has 16 divisors (see below), whose sum is σ = 2940537600. Its totient is φ = 2402592192.

The previous prime is 2666397611. The next prime is 2666397647. The reversal of 2666397617 is 7167936662.

It is not a de Polignac number, because 2666397617 - 2⁸ = 2666397361 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is not an unprimeable number, because it can be changed into a prime (2666397611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 127388 + ... + 146834.

It is an arithmetic number, because the mean of its divisors is an integer number (183783600).

Almost surely, 2^2666397617 is an apocalyptic number.

It is an amenable number.

2666397617 is a deficient number, since it is larger than the sum of its proper divisors (274139983).

2666397617 is a wasteful number, since it uses less digits than its factorization.

2666397617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19712.

The product of its digits is 3429216, while the sum is 53.

The square root of 2666397617 is about 51637.1728215246. The cubic root of 2666397617 is about 1386.6759099778.

The spelling of 2666397617 in words is "two billion, six hundred sixty-six million, three hundred ninety-seven thousand, six hundred seventeen".