256201643 has 8 divisors (see below), whose sum is σ = 269867520. Its totient is φ = 242553960.

The previous prime is 256201609. The next prime is 256201657. The reversal of 256201643 is 346102652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 256201643 - 2¹⁶ = 256136107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256201663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31946 + ... + 39152.

It is an arithmetic number, because the mean of its divisors is an integer number (33733440).

Almost surely, 2^256201643 is an apocalyptic number.

256201643 is a deficient number, since it is larger than the sum of its proper divisors (13665877).

256201643 is a wasteful number, since it uses less digits than its factorization.

256201643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9097.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 256201643 is about 16006.3001033968. The cubic root of 256201643 is about 635.1270896966.

The spelling of 256201643 in words is "two hundred fifty-six million, two hundred one thousand, six hundred forty-three".