2666641 has 2 divisors, whose sum is σ = 2666642. Its totient is φ = 2666640.

The previous prime is 2666633. The next prime is 2666647. The reversal of 2666641 is 1466662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1745041 + 921600 = 1321^2 + 960^2 .

It is a cyclic number.

It is not a de Polignac number, because 2666641 - 2³ = 2666633 is a prime.

It is a super-2 number, since 2×2666641² = 14221948445762, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2666647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1333320 + 1333321.

It is an arithmetic number, because the mean of its divisors is an integer number (1333321).

2^2666641 is an apocalyptic number.

It is an amenable number.

2666641 is a deficient number, since it is larger than the sum of its proper divisors (1).

2666641 is an equidigital number, since it uses as much as digits as its factorization.

2666641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 31.

The square root of 2666641 is about 1632.9853030570. The cubic root of 2666641 is about 138.6718099619.

The spelling of 2666641 in words is "two million, six hundred sixty-six thousand, six hundred forty-one".