2666749 has 2 divisors, whose sum is σ = 2666750. Its totient is φ = 2666748.

The previous prime is 2666747. The next prime is 2666779. The reversal of 2666749 is 9476662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2502724 + 164025 = 1582^2 + 405^2 .

It is a cyclic number.

It is not a de Polignac number, because 2666749 - 2¹ = 2666747 is a prime.

It is a super-2 number, since 2×2666749² = 14223100458002, which contains 22 as substring.

Together with 2666747, it forms a pair of twin primes.

It is a Chen prime.

2666749 is a lucky number.

It is a nialpdrome in base 12.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2666743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1333374 + 1333375.

It is an arithmetic number, because the mean of its divisors is an integer number (1333375).

2^2666749 is an apocalyptic number.

It is an amenable number.

2666749 is a deficient number, since it is larger than the sum of its proper divisors (1).

2666749 is an equidigital number, since it uses as much as digits as its factorization.

2666749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 40.

The square root of 2666749 is about 1633.0183709928. The cubic root of 2666749 is about 138.6736820241.

The spelling of 2666749 in words is "two million, six hundred sixty-six thousand, seven hundred forty-nine".