255638343165780 has 96 divisors (see below), whose sum is σ = 725603414256000. Its totient is φ = 67235390281728.

The previous prime is 255638343165761. The next prime is 255638343165841. The reversal of 255638343165780 is 87561343836552.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 322931896 + ... + 323722544.

It is an arithmetic number, because the mean of its divisors is an integer number (7558368898500).

Almost surely, 2^{255638343165780} is an apocalyptic number.

255638343165780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

255638343165780 is an abundant number, since it is smaller than the sum of its proper divisors (469965071090220).

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

255638343165780 is a wasteful number, since it uses less digits than its factorization.

255638343165780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 864553 (or 864551 counting only the distinct ones).

The product of its (nonzero) digits is 435456000, while the sum is 66.

The spelling of 255638343165780 in words is "two hundred fifty-five trillion, six hundred thirty-eight billion, three hundred forty-three million, one hundred sixty-five thousand, seven hundred eighty".