2565382516 has 6 divisors (see below), whose sum is σ = 4489419410. Its totient is φ = 1282691256.

The previous prime is 2565382493. The next prime is 2565382517. The reversal of 2565382516 is 6152835652.

It can be written as a sum of positive squares in only one way, i.e., 1595682916 + 969699600 = 39946^2 + 31140^2 .

It is a super-5 number, since 5×2565382516⁵ (a number of 48 digits) contains 55555 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2565382517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320672811 + ... + 320672818.

Almost surely, 2^2565382516 is an apocalyptic number.

It is an amenable number.

2565382516 is a deficient number, since it is larger than the sum of its proper divisors (1924036894).

2565382516 is a wasteful number, since it uses less digits than its factorization.

2565382516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 641345633 (or 641345631 counting only the distinct ones).

The product of its digits is 432000, while the sum is 43.

The square root of 2565382516 is about 50649.6052896762. The cubic root of 2565382516 is about 1368.9388333650.

The spelling of 2565382516 in words is "two billion, five hundred sixty-five million, three hundred eighty-two thousand, five hundred sixteen".