255978613128 has 64 divisors (see below), whose sum is σ = 749205717120. Its totient is φ = 71352921600.

The previous prime is 255978613117. The next prime is 255978613139. The reversal of 255978613128 is 821316879552.

It is an interprime number because it is at equal distance from previous prime (255978613117) and next prime (255978613139).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18574603 + ... + 18588378.

It is an arithmetic number, because the mean of its divisors is an integer number (11706339330).

Almost surely, 2^255978613128 is an apocalyptic number.

255978613128 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

255978613128 is an abundant number, since it is smaller than the sum of its proper divisors (493227103992).

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

255978613128 is a wasteful number, since it uses less digits than its factorization.

255978613128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37163038 (or 37163034 counting only the distinct ones).

The product of its digits is 7257600, while the sum is 57.

The spelling of 255978613128 in words is "two hundred fifty-five billion, nine hundred seventy-eight million, six hundred thirteen thousand, one hundred twenty-eight".