2565225646 has 4 divisors (see below), whose sum is σ = 3847838472. Its totient is φ = 1282612822.

The previous prime is 2565225631. The next prime is 2565225647. The reversal of 2565225646 is 6465225652.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×2565225646² = 13160765229792234632, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2565225647) 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, 641306410 + ... + 641306413.

It is an arithmetic number, because the mean of its divisors is an integer number (961959618).

Almost surely, 2^2565225646 is an apocalyptic number.

2565225646 is a deficient number, since it is larger than the sum of its proper divisors (1282612826).

2565225646 is a wasteful number, since it uses less digits than its factorization.

2565225646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1282612825.

The product of its digits is 864000, while the sum is 43.

The square root of 2565225646 is about 50648.0566853260. The cubic root of 2565225646 is about 1368.9109298183.

The spelling of 2565225646 in words is "two billion, five hundred sixty-five million, two hundred twenty-five thousand, six hundred forty-six".