2666487717 has 36 divisors (see below), whose sum is σ = 3982551300. Its totient is φ = 1718585856.

The previous prime is 2666487701. The next prime is 2666487751. The reversal of 2666487717 is 7177846662.

It can be written as a sum of positive squares in 6 ways, for example, as 443270916 + 2223216801 = 21054^2 + 47151^2 .

It is not a de Polignac number, because 2666487717 - 2⁴ = 2666487701 is a prime.

It is a super-2 number, since 2×2666487717² = 14220313489823744178, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2666489717) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2541409 + ... + 2542457.

It is an arithmetic number, because the mean of its divisors is an integer number (110626425).

Almost surely, 2^2666487717 is an apocalyptic number.

It is an amenable number.

2666487717 is a deficient number, since it is larger than the sum of its proper divisors (1316063583).

2666487717 is a wasteful number, since it uses less digits than its factorization.

2666487717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1254 (or 1178 counting only the distinct ones).

The product of its digits is 4741632, while the sum is 54.

The square root of 2666487717 is about 51638.0452476660. The cubic root of 2666487717 is about 1386.6915288152.

The spelling of 2666487717 in words is "two billion, six hundred sixty-six million, four hundred eighty-seven thousand, seven hundred seventeen".