256155152666 has 16 divisors (see below), whose sum is σ = 439787466240. Its totient is φ = 109614692880.

The previous prime is 256155152653. The next prime is 256155152681. The reversal of 256155152666 is 666251551652.

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 7 ways as a sum of consecutive naturals, for example, 13830986 + ... + 13849493.

It is an arithmetic number, because the mean of its divisors is an integer number (27486716640).

Almost surely, 2^256155152666 is an apocalyptic number.

256155152666 is a deficient number, since it is larger than the sum of its proper divisors (183632313574).

256155152666 is a wasteful number, since it uses less digits than its factorization.

256155152666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27681149.

The product of its digits is 3240000, while the sum is 50.

The spelling of 256155152666 in words is "two hundred fifty-six billion, one hundred fifty-five million, one hundred fifty-two thousand, six hundred sixty-six".