256566522 has 16 divisors (see below), whose sum is σ = 513855360. Its totient is φ = 85401792.

The previous prime is 256566503. The next prime is 256566553. The reversal of 256566522 is 225665652.

It is a super-2 number, since 2×256566522² = 131652760422352968, which contains 22 as substring.

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, 25423 + ... + 34050.

It is an arithmetic number, because the mean of its divisors is an integer number (32115960).

Almost surely, 2^256566522 is an apocalyptic number.

256566522 is an abundant number, since it is smaller than the sum of its proper divisors (257288838).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256566522 is a wasteful number, since it uses less digits than its factorization.

256566522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60197.

The product of its digits is 216000, while the sum is 39.

The square root of 256566522 is about 16017.6940287920. The cubic root of 256566522 is about 635.4284598801.

The spelling of 256566522 in words is "two hundred fifty-six million, five hundred sixty-six thousand, five hundred twenty-two".