255399511866 has 16 divisors (see below), whose sum is σ = 540846025344. Its totient is φ = 80125337024.

The previous prime is 255399511853. The next prime is 255399511879. The reversal of 255399511866 is 668115993552.

It is an interprime number because it is at equal distance from previous prime (255399511853) and next prime (255399511879).

It is a super-2 number, since 2×255399511866² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1251958290 + ... + 1251958493.

It is an arithmetic number, because the mean of its divisors is an integer number (33802876584).

Almost surely, 2^255399511866 is an apocalyptic number.

255399511866 is an abundant number, since it is smaller than the sum of its proper divisors (285446513478).

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

255399511866 is a wasteful number, since it uses less digits than its factorization.

255399511866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2503916805.

The product of its digits is 17496000, while the sum is 60.

The spelling of 255399511866 in words is "two hundred fifty-five billion, three hundred ninety-nine million, five hundred eleven thousand, eight hundred sixty-six".