256603400611 has 4 divisors (see below), whose sum is σ = 271697718312. Its totient is φ = 241509082912.

The previous prime is 256603400609. The next prime is 256603400687. The reversal of 256603400611 is 116004306652.

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

It is a cyclic number.

It is not a de Polignac number, because 256603400611 - 2¹ = 256603400609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256603406611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7547158825 + ... + 7547158858.

It is an arithmetic number, because the mean of its divisors is an integer number (67924429578).

Almost surely, 2^256603400611 is an apocalyptic number.

256603400611 is a deficient number, since it is larger than the sum of its proper divisors (15094317701).

256603400611 is a wasteful number, since it uses less digits than its factorization.

256603400611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15094317700.

The product of its (nonzero) digits is 25920, while the sum is 34.

The spelling of 256603400611 in words is "two hundred fifty-six billion, six hundred three million, four hundred thousand, six hundred eleven".