255979999 has 16 divisors (see below), whose sum is σ = 300105216. Its totient is φ = 215740800.

The previous prime is 255979991. The next prime is 255980003. The reversal of 255979999 is 999979552.

It is not a de Polignac number, because 255979999 - 2³ = 255979991 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 255979999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255979991) 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, 2314 + ... + 22744.

It is an arithmetic number, because the mean of its divisors is an integer number (18756576).

Almost surely, 2^255979999 is an apocalyptic number.

255979999 is a deficient number, since it is larger than the sum of its proper divisors (44125217).

255979999 is a wasteful number, since it uses less digits than its factorization.

255979999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20526.

The product of its digits is 20667150, while the sum is 64.

The square root of 255979999 is about 15999.3749565413. The cubic root of 255979999 is about 634.9438841022.

The spelling of 255979999 in words is "two hundred fifty-five million, nine hundred seventy-nine thousand, nine hundred ninety-nine".