2656610491 has 2 divisors, whose sum is σ = 2656610492. Its totient is φ = 2656610490.

The previous prime is 2656610459. The next prime is 2656610581. The reversal of 2656610491 is 1940166562.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2656610491 - 2⁵ = 2656610459 is a prime.

It is a super-2 number, since 2×2656610491² = 14115158601782522162, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2656610401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1328305245 + 1328305246.

It is an arithmetic number, because the mean of its divisors is an integer number (1328305246).

Almost surely, 2^2656610491 is an apocalyptic number.

2656610491 is a deficient number, since it is larger than the sum of its proper divisors (1).

2656610491 is an equidigital number, since it uses as much as digits as its factorization.

2656610491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 2656610491 is about 51542.3174779714. The cubic root of 2656610491 is about 1384.9772122392.

The spelling of 2656610491 in words is "two billion, six hundred fifty-six million, six hundred ten thousand, four hundred ninety-one".