2640509425 has 12 divisors (see below), whose sum is σ = 3286060636. Its totient is φ = 2104776000.

The previous prime is 2640509419. The next prime is 2640509437. The reversal of 2640509425 is 5249050462.

It can be written as a sum of positive squares in 6 ways, for example, as 78428736 + 2562080689 = 8856^2 + 50617^2 .

It is not a de Polignac number, because 2640509425 - 2¹¹ = 2640507377 is a prime.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 183726 + ... + 197575.

Almost surely, 2^2640509425 is an apocalyptic number.

2640509425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2640509425 is a deficient number, since it is larger than the sum of its proper divisors (645551211).

2640509425 is a wasteful number, since it uses less digits than its factorization.

2640509425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381588 (or 381583 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 37.

The square root of 2640509425 is about 51385.8874108446. The cubic root of 2640509425 is about 1382.1735378190.

Adding to 2640509425 its reverse (5249050462), we get a palindrome (7889559887).

The spelling of 2640509425 in words is "two billion, six hundred forty million, five hundred nine thousand, four hundred twenty-five".