2640430565 has 8 divisors (see below), whose sum is σ = 3354900120. Its totient is φ = 1988088832.

The previous prime is 2640430489. The next prime is 2640430571. The reversal of 2640430565 is 5650340462.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 153313924 + 2487116641 = 12382^2 + 49871^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2640430565 - 2²⁶ = 2573321701 is a prime.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 15531860 + ... + 15532029.

It is an arithmetic number, because the mean of its divisors is an integer number (419362515).

Almost surely, 2^2640430565 is an apocalyptic number.

It is an amenable number.

2640430565 is a deficient number, since it is larger than the sum of its proper divisors (714469555).

2640430565 is a wasteful number, since it uses less digits than its factorization.

2640430565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31063911.

The product of its (nonzero) digits is 86400, while the sum is 35.

The square root of 2640430565 is about 51385.1200738113. The cubic root of 2640430565 is about 1382.1597779375.

The spelling of 2640430565 in words is "two billion, six hundred forty million, four hundred thirty thousand, five hundred sixty-five".