256161553 has 16 divisors (see below), whose sum is σ = 281764800. Its totient is φ = 231940800.

The previous prime is 256161547. The next prime is 256161583. The reversal of 256161553 is 355161652.

256161553 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 256161553 - 2⁹ = 256161041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256161533) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53350 + ... + 57952.

It is an arithmetic number, because the mean of its divisors is an integer number (17610300).

Almost surely, 2^256161553 is an apocalyptic number.

It is an amenable number.

256161553 is a deficient number, since it is larger than the sum of its proper divisors (25603247).

256161553 is a wasteful number, since it uses less digits than its factorization.

256161553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4752.

The product of its digits is 27000, while the sum is 34.

The square root of 256161553 is about 16005.0477350116. The cubic root of 256161553 is about 635.0939600974.

Subtracting 256161553 from its reverse (355161652), we obtain a palindrome (99000099).

The spelling of 256161553 in words is "two hundred fifty-six million, one hundred sixty-one thousand, five hundred fifty-three".