255305660172 has 12 divisors (see below), whose sum is σ = 595713207096. Its totient is φ = 85101886720.

The previous prime is 255305660123. The next prime is 255305660173. The reversal of 255305660172 is 271066503552.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (255305660173) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10637735829 + ... + 10637735852.

It is an arithmetic number, because the mean of its divisors is an integer number (49642767258).

Almost surely, 2^255305660172 is an apocalyptic number.

It is an amenable number.

255305660172 is an abundant number, since it is smaller than the sum of its proper divisors (340407546924).

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

255305660172 is a wasteful number, since it uses less digits than its factorization.

255305660172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21275471688 (or 21275471686 counting only the distinct ones).

The product of its (nonzero) digits is 378000, while the sum is 42.

The spelling of 255305660172 in words is "two hundred fifty-five billion, three hundred five million, six hundred sixty thousand, one hundred seventy-two".