256521652011 has 12 divisors (see below), whose sum is σ = 370541233192. Its totient is φ = 171009838656.

The previous prime is 256521652007. The next prime is 256521652021. The reversal of 256521652011 is 110256125652.

256521652011 is a `hidden beast` number, since 2 + 56 + 521 + 65 + 20 + 1 + 1 = 666.

It is not a de Polignac number, because 256521652011 - 2² = 256521652007 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256521652021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10441 + ... + 716346.

Almost surely, 2^256521652011 is an apocalyptic number.

256521652011 is a deficient number, since it is larger than the sum of its proper divisors (114019581181).

256521652011 is a wasteful number, since it uses less digits than its factorization.

256521652011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 766010 (or 766007 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 36.

Adding to 256521652011 its reverse (110256125652), we get a palindrome (366777777663).

The spelling of 256521652011 in words is "two hundred fifty-six billion, five hundred twenty-one million, six hundred fifty-two thousand, eleven".