2640443497 has 2 divisors, whose sum is σ = 2640443498. Its totient is φ = 2640443496.

The previous prime is 2640443483. The next prime is 2640443521. The reversal of 2640443497 is 7943440462.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2442731776 + 197711721 = 49424^2 + 14061^2 .

It is a cyclic number.

It is not a de Polignac number, because 2640443497 - 2²⁷ = 2506225769 is a prime.

It is not a weakly prime, because it can be changed into another prime (2640443297) 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, 1320221748 + 1320221749.

It is an arithmetic number, because the mean of its divisors is an integer number (1320221749).

Almost surely, 2^2640443497 is an apocalyptic number.

It is an amenable number.

2640443497 is a deficient number, since it is larger than the sum of its proper divisors (1).

2640443497 is an equidigital number, since it uses as much as digits as its factorization.

2640443497 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 580608, while the sum is 43.

The square root of 2640443497 is about 51385.2459077506. The cubic root of 2640443497 is about 1382.1620343954.

The spelling of 2640443497 in words is "two billion, six hundred forty million, four hundred forty-three thousand, four hundred ninety-seven".