256201556 has 12 divisors (see below), whose sum is σ = 482841492. Its totient is φ = 118246848.

The previous prime is 256201493. The next prime is 256201591. The reversal of 256201556 is 655102652.

256201556 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 158508100 + 97693456 = 12590^2 + 9884^2 .

It is a super-2 number, since 2×256201556² = 131278474593642272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2463425 + ... + 2463528.

It is an arithmetic number, because the mean of its divisors is an integer number (40236791).

Almost surely, 2^256201556 is an apocalyptic number.

256201556 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

256201556 is a deficient number, since it is larger than the sum of its proper divisors (226639936).

256201556 is a wasteful number, since it uses less digits than its factorization.

256201556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4926970 (or 4926968 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 32.

The square root of 256201556 is about 16006.2973857167. The cubic root of 256201556 is about 635.1270178053.

The spelling of 256201556 in words is "two hundred fifty-six million, two hundred one thousand, five hundred fifty-six".