256162661 has 4 divisors (see below), whose sum is σ = 267300192. Its totient is φ = 245025132.

The previous prime is 256162633. The next prime is 256162663. The reversal of 256162661 is 166261652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 256162661 - 2¹⁰ = 256161637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256162663) 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, 5568731 + ... + 5568776.

It is an arithmetic number, because the mean of its divisors is an integer number (66825048).

Almost surely, 2^256162661 is an apocalyptic number.

It is an amenable number.

256162661 is a deficient number, since it is larger than the sum of its proper divisors (11137531).

256162661 is a wasteful number, since it uses less digits than its factorization.

256162661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11137530.

The product of its digits is 25920, while the sum is 35.

The square root of 256162661 is about 16005.0823490540. The cubic root of 256162661 is about 635.0948757736.

The spelling of 256162661 in words is "two hundred fifty-six million, one hundred sixty-two thousand, six hundred sixty-one".