2666299981 has 2 divisors, whose sum is σ = 2666299982. Its totient is φ = 2666299980.

The previous prime is 2666299969. The next prime is 2666300029. The reversal of 2666299981 is 1899926662.

2666299981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2651323081 + 14976900 = 51491^2 + 3870^2 .

It is a cyclic number.

It is not a de Polignac number, because 2666299981 - 2⁵ = 2666299949 is a prime.

It is a super-2 number, since 2×2666299981² = 14218311177361200722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2666299931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1333149990 + 1333149991.

It is an arithmetic number, because the mean of its divisors is an integer number (1333149991).

Almost surely, 2^2666299981 is an apocalyptic number.

It is an amenable number.

2666299981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2666299981 is an equidigital number, since it uses as much as digits as its factorization.

2666299981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5038848, while the sum is 58.

The square root of 2666299981 is about 51636.2274086711. The cubic root of 2666299981 is about 1386.6589843774.

The spelling of 2666299981 in words is "two billion, six hundred sixty-six million, two hundred ninety-nine thousand, nine hundred eighty-one".