256672250121 has 16 divisors (see below), whose sum is σ = 391292067200. Its totient is φ = 146605189248.

The previous prime is 256672250089. The next prime is 256672250137. The reversal of 256672250121 is 121052276652.

It is not a de Polignac number, because 256672250121 - 2⁵ = 256672250089 is a prime.

It is a Duffinian number.

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 256672250121.

It is not an unprimeable number, because it can be changed into a prime (256672250141) 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, 2645716 + ... + 2741013.

It is an arithmetic number, because the mean of its divisors is an integer number (24455754200).

Almost surely, 2^256672250121 is an apocalyptic number.

256672250121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

256672250121 is a deficient number, since it is larger than the sum of its proper divisors (134619817079).

256672250121 is a wasteful number, since it uses less digits than its factorization.

256672250121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5389008.

The product of its (nonzero) digits is 100800, while the sum is 39.

The spelling of 256672250121 in words is "two hundred fifty-six billion, six hundred seventy-two million, two hundred fifty thousand, one hundred twenty-one".