2640860449 has 2 divisors, whose sum is σ = 2640860450. Its totient is φ = 2640860448.

The previous prime is 2640860447. The next prime is 2640860491. The reversal of 2640860449 is 9440680462.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1473408225 + 1167452224 = 38385^2 + 34168^2 .

It is a cyclic number.

It is not a de Polignac number, because 2640860449 - 2¹ = 2640860447 is a prime.

It is a super-2 number, since 2×2640860449² = 13948287822184963202, which contains 22 as substring.

Together with 2640860447, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2640860441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1320430224 + 1320430225.

It is an arithmetic number, because the mean of its divisors is an integer number (1320430225).

Almost surely, 2^2640860449 is an apocalyptic number.

It is an amenable number.

2640860449 is a deficient number, since it is larger than the sum of its proper divisors (1).

2640860449 is an equidigital number, since it uses as much as digits as its factorization.

2640860449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 331776, while the sum is 43.

The square root of 2640860449 is about 51389.3028654797. The cubic root of 2640860449 is about 1382.2347828931.

The spelling of 2640860449 in words is "two billion, six hundred forty million, eight hundred sixty thousand, four hundred forty-nine".