2666250491 has 2 divisors, whose sum is σ = 2666250492. Its totient is φ = 2666250490.

The previous prime is 2666250479. The next prime is 2666250523. The reversal of 2666250491 is 1940526662.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2666250491 - 2¹⁴ = 2666234107 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (2666250421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1333125245 + 1333125246.

It is an arithmetic number, because the mean of its divisors is an integer number (1333125246).

Almost surely, 2^2666250491 is an apocalyptic number.

2666250491 is a deficient number, since it is larger than the sum of its proper divisors (1).

2666250491 is an equidigital number, since it uses as much as digits as its factorization.

2666250491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 155520, while the sum is 41.

The square root of 2666250491 is about 51635.7481886338. The cubic root of 2666250491 is about 1386.6504049254.

The spelling of 2666250491 in words is "two billion, six hundred sixty-six million, two hundred fifty thousand, four hundred ninety-one".