255161968386864 has 240 divisors, whose sum is σ = 838679823912960. Its totient is φ = 66102789419520.

The previous prime is 255161968386811. The next prime is 255161968386889. The reversal of 255161968386864 is 468683869161552.

It is a super-2 number, since 2×255161968386864² (a number of 30 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 255161968386864.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2966319 + ... + 22784270.

It is an arithmetic number, because the mean of its divisors is an integer number (3494499266304).

Almost surely, 2^{255161968386864} is an apocalyptic number.

255161968386864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 255161968386864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (419339911956480).

255161968386864 is an abundant number, since it is smaller than the sum of its proper divisors (583517855526096).

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

255161968386864 is a wasteful number, since it uses less digits than its factorization.

255161968386864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25751008 (or 25750995 counting only the distinct ones).

The product of its digits is 3583180800, while the sum is 78.

The spelling of 255161968386864 in words is "two hundred fifty-five trillion, one hundred sixty-one billion, nine hundred sixty-eight million, three hundred eighty-six thousand, eight hundred sixty-four".