256501345 has 8 divisors (see below), whose sum is σ = 312137280. Its totient is φ = 202310640.

The previous prime is 256501339. The next prime is 256501367. The reversal of 256501345 is 543105652.

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

It is not a de Polignac number, because 256501345 - 2³ = 256501337 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 360915 + ... + 361624.

It is an arithmetic number, because the mean of its divisors is an integer number (39017160).

Almost surely, 2^256501345 is an apocalyptic number.

It is an amenable number.

256501345 is a deficient number, since it is larger than the sum of its proper divisors (55635935).

256501345 is an equidigital number, since it uses as much as digits as its factorization.

256501345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 722615.

The product of its (nonzero) digits is 18000, while the sum is 31.

The square root of 256501345 is about 16015.6593682558. The cubic root of 256501345 is about 635.3746481982.

Adding to 256501345 its reverse (543105652), we get a palindrome (799606997).

The spelling of 256501345 in words is "two hundred fifty-six million, five hundred one thousand, three hundred forty-five".