256168021106 has 8 divisors (see below), whose sum is σ = 384363001344. Its totient is φ = 128047020660.

The previous prime is 256168021061. The next prime is 256168021133. The reversal of 256168021106 is 601120861652.

It is a happy number.

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

It is a super-2 number, since 2×256168021106² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 256168021106.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18486290 + ... + 18500141.

It is an arithmetic number, because the mean of its divisors is an integer number (48045375168).

Almost surely, 2^256168021106 is an apocalyptic number.

256168021106 is a deficient number, since it is larger than the sum of its proper divisors (128194980238).

256168021106 is a wasteful number, since it uses less digits than its factorization.

256168021106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36989896.

The product of its (nonzero) digits is 34560, while the sum is 38.

Adding to 256168021106 its reverse (601120861652), we get a palindrome (857288882758).

The spelling of 256168021106 in words is "two hundred fifty-six billion, one hundred sixty-eight million, twenty-one thousand, one hundred six".