256146643 has 4 divisors (see below), whose sum is σ = 256261608. Its totient is φ = 256031680.

The previous prime is 256146641. The next prime is 256146659. The reversal of 256146643 is 346641652.

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 256146643 - 2¹ = 256146641 is a prime.

It is a super-2 number, since 2×256146643² = 131222205440338898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256146641) 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, 54073 + ... + 58618.

It is an arithmetic number, because the mean of its divisors is an integer number (64065402).

Almost surely, 2^256146643 is an apocalyptic number.

256146643 is a deficient number, since it is larger than the sum of its proper divisors (114965).

256146643 is a wasteful number, since it uses less digits than its factorization.

256146643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114964.

The product of its digits is 103680, while the sum is 37.

The square root of 256146643 is about 16004.5819376827. The cubic root of 256146643 is about 635.0816378805.

The spelling of 256146643 in words is "two hundred fifty-six million, one hundred forty-six thousand, six hundred forty-three".