256061885 has 4 divisors (see below), whose sum is σ = 307274268. Its totient is φ = 204849504.

The previous prime is 256061863. The next prime is 256061893. The reversal of 256061885 is 588160652.

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

It can be written as a sum of positive squares in 2 ways, for example, as 114618436 + 141443449 = 10706^2 + 11893^2 .

It is a cyclic number.

It is not a de Polignac number, because 256061885 - 2⁸ = 256061629 is a prime.

It is a Duffinian number.

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, 25606184 + ... + 25606193.

It is an arithmetic number, because the mean of its divisors is an integer number (76818567).

Almost surely, 2^256061885 is an apocalyptic number.

It is an amenable number.

256061885 is a deficient number, since it is larger than the sum of its proper divisors (51212383).

256061885 is an equidigital number, since it uses as much as digits as its factorization.

256061885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51212382.

The product of its (nonzero) digits is 115200, while the sum is 41.

The square root of 256061885 is about 16001.9337893893. The cubic root of 256061885 is about 635.0115814119.

The spelling of 256061885 in words is "two hundred fifty-six million, sixty-one thousand, eight hundred eighty-five".