2556526564 has 6 divisors (see below), whose sum is σ = 4473921494. Its totient is φ = 1278263280.

The previous prime is 2556526547. The next prime is 2556526579. The reversal of 2556526564 is 4656256552.

It can be written as a sum of positive squares in only one way, i.e., 2222368164 + 334158400 = 47142^2 + 18280^2 .

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 as a sum of consecutive naturals, namely, 319565817 + ... + 319565824.

Almost surely, 2^2556526564 is an apocalyptic number.

It is an amenable number.

2556526564 is a deficient number, since it is larger than the sum of its proper divisors (1917394930).

2556526564 is a wasteful number, since it uses less digits than its factorization.

2556526564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639131645 (or 639131643 counting only the distinct ones).

The product of its digits is 2160000, while the sum is 46.

The square root of 2556526564 is about 50562.1060083537. The cubic root of 2556526564 is about 1367.3617802273.

The spelling of 2556526564 in words is "two billion, five hundred fifty-six million, five hundred twenty-six thousand, five hundred sixty-four".