2640849427 has 2 divisors, whose sum is σ = 2640849428. Its totient is φ = 2640849426.

The previous prime is 2640849389. The next prime is 2640849439. The reversal of 2640849427 is 7249480462.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2640849427 is a prime.

It is not a weakly prime, because it can be changed into another prime (2640849457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1320424713 + 1320424714.

It is an arithmetic number, because the mean of its divisors is an integer number (1320424714).

Almost surely, 2^2640849427 is an apocalyptic number.

2640849427 is a deficient number, since it is larger than the sum of its proper divisors (1).

2640849427 is an equidigital number, since it uses as much as digits as its factorization.

2640849427 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 774144, while the sum is 46.

The square root of 2640849427 is about 51389.1956251506. The cubic root of 2640849427 is about 1382.2328599071.

The spelling of 2640849427 in words is "two billion, six hundred forty million, eight hundred forty-nine thousand, four hundred twenty-seven".