2640509437 has 2 divisors, whose sum is σ = 2640509438. Its totient is φ = 2640509436.

The previous prime is 2640509419. The next prime is 2640509447. The reversal of 2640509437 is 7349050462.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2602428196 + 38081241 = 51014^2 + 6171^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2640509437 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2640509437.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2640509407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1320254718 + 1320254719.

It is an arithmetic number, because the mean of its divisors is an integer number (1320254719).

Almost surely, 2^2640509437 is an apocalyptic number.

It is an amenable number.

2640509437 is a deficient number, since it is larger than the sum of its proper divisors (1).

2640509437 is an equidigital number, since it uses as much as digits as its factorization.

2640509437 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 40.

The square root of 2640509437 is about 51385.8875276082. The cubic root of 2640509437 is about 1382.1735399128.

Adding to 2640509437 its reverse (7349050462), we get a palindrome (9989559899).

The spelling of 2640509437 in words is "two billion, six hundred forty million, five hundred nine thousand, four hundred thirty-seven".