256400611 has 12 divisors (see below), whose sum is σ = 272290032. Its totient is φ = 241394544.

The previous prime is 256400609. The next prime is 256400653. The reversal of 256400611 is 116004652.

It is not a de Polignac number, because 256400611 - 2¹ = 256400609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256403611) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 58161 + ... + 62413.

It is an arithmetic number, because the mean of its divisors is an integer number (22690836).

Almost surely, 2^256400611 is an apocalyptic number.

256400611 is a deficient number, since it is larger than the sum of its proper divisors (15889421).

256400611 is a wasteful number, since it uses less digits than its factorization.

256400611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4458 (or 4439 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 256400611 is about 16012.5141998376. The cubic root of 256400611 is about 635.2914618765.

The spelling of 256400611 in words is "two hundred fifty-six million, four hundred thousand, six hundred eleven".