2646660491 has 2 divisors, whose sum is σ = 2646660492. Its totient is φ = 2646660490.

The previous prime is 2646660473. The next prime is 2646660593. The reversal of 2646660491 is 1940666462.

It is a happy number.

2646660491 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 is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2646660491 is a prime.

It is a super-2 number, since 2×2646660491² = 14009623509240722162, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2646660391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1323330245 + 1323330246.

It is an arithmetic number, because the mean of its divisors is an integer number (1323330246).

Almost surely, 2^2646660491 is an apocalyptic number.

2646660491 is a deficient number, since it is larger than the sum of its proper divisors (1).

2646660491 is an equidigital number, since it uses as much as digits as its factorization.

2646660491 is an evil number, because the sum of its binary digits is even.

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

The square root of 2646660491 is about 51445.7043007480. The cubic root of 2646660491 is about 1383.2459631405.

The spelling of 2646660491 in words is "two billion, six hundred forty-six million, six hundred sixty thousand, four hundred ninety-one".