256673653 has 8 divisors (see below), whose sum is σ = 263329920. Its totient is φ = 250036320.

The previous prime is 256673611. The next prime is 256673657. The reversal of 256673653 is 356376652.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256673653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256673657) 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, 25126 + ... + 33832.

It is an arithmetic number, because the mean of its divisors is an integer number (32916240).

Almost surely, 2^256673653 is an apocalyptic number.

It is an amenable number.

256673653 is a deficient number, since it is larger than the sum of its proper divisors (6656267).

256673653 is an equidigital number, since it uses as much as digits as its factorization.

256673653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9467.

The product of its digits is 680400, while the sum is 43.

The square root of 256673653 is about 16021.0378253096. The cubic root of 256673653 is about 635.5168899854.

The spelling of 256673653 in words is "two hundred fifty-six million, six hundred seventy-three thousand, six hundred fifty-three".