256169466 has 80 divisors (see below), whose sum is σ = 659602944. Its totient is φ = 72791136.

The previous prime is 256169453. The next prime is 256169471. The reversal of 256169466 is 664961652.

256169466 is a `hidden beast` number, since 25 + 6 + 169 + 466 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 252376 + ... + 253388.

Almost surely, 2^256169466 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 256169466, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (329801472).

256169466 is an abundant number, since it is smaller than the sum of its proper divisors (403433478).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256169466 is a wasteful number, since it uses less digits than its factorization.

256169466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1257 (or 1248 counting only the distinct ones).

The product of its digits is 466560, while the sum is 45.

The square root of 256169466 is about 16005.2949363640. The cubic root of 256169466 is about 635.1004995211.

It can be divided in two parts, 2561 and 69466, that added together give a palindrome (72027).

The spelling of 256169466 in words is "two hundred fifty-six million, one hundred sixty-nine thousand, four hundred sixty-six".