256621060766611 has 16 divisors (see below), whose sum is σ = 271955294825760. Its totient is φ = 241313381936640.

The previous prime is 256621060766573. The next prime is 256621060766647. The reversal of 256621060766611 is 116667060126652.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 256621060766611 - 2²³ = 256621052378003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256621060766311) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 674778565 + ... + 675158761.

It is an arithmetic number, because the mean of its divisors is an integer number (16997205926610).

Almost surely, 2^{256621060766611} is an apocalyptic number.

256621060766611 is a deficient number, since it is larger than the sum of its proper divisors (15334234059149).

256621060766611 is a wasteful number, since it uses less digits than its factorization.

256621060766611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415014.

The product of its (nonzero) digits is 6531840, while the sum is 55.

The spelling of 256621060766611 in words is "two hundred fifty-six trillion, six hundred twenty-one billion, sixty million, seven hundred sixty-six thousand, six hundred eleven".