2666601449 has 2 divisors, whose sum is σ = 2666601450. Its totient is φ = 2666601448.

The previous prime is 2666601409. The next prime is 2666601491. The reversal of 2666601449 is 9441066662.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2626050025 + 40551424 = 51245^2 + 6368^2 .

It is a cyclic number.

It is not a de Polignac number, because 2666601449 - 2⁸ = 2666601193 is a prime.

It is a super-3 number, since 3×2666601449³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (2666601409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1333300724 + 1333300725.

It is an arithmetic number, because the mean of its divisors is an integer number (1333300725).

Almost surely, 2^2666601449 is an apocalyptic number.

It is an amenable number.

2666601449 is a deficient number, since it is larger than the sum of its proper divisors (1).

2666601449 is an equidigital number, since it uses as much as digits as its factorization.

2666601449 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 373248, while the sum is 44.

The square root of 2666601449 is about 51639.1464782291. The cubic root of 2666601449 is about 1386.7112437580.

The spelling of 2666601449 in words is "two billion, six hundred sixty-six million, six hundred one thousand, four hundred forty-nine".