255511421505 has 24 divisors (see below), whose sum is σ = 442898539200. Its totient is φ = 136269042720.

The previous prime is 255511421491. The next prime is 255511421513. The reversal of 255511421505 is 505124115552.

255511421505 is a `hidden beast` number, since 2 + 5 + 5 + 5 + 1 + 142 + 1 + 505 = 666.

It is not a de Polignac number, because 255511421505 - 2³⁰ = 254437679681 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 255511421505.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2638900 + ... + 2734010.

It is an arithmetic number, because the mean of its divisors is an integer number (18454105800).

Almost surely, 2^255511421505 is an apocalyptic number.

It is an amenable number.

255511421505 is a deficient number, since it is larger than the sum of its proper divisors (187387117695).

255511421505 is a wasteful number, since it uses less digits than its factorization.

255511421505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154821 (or 154818 counting only the distinct ones).

The product of its (nonzero) digits is 50000, while the sum is 36.

The spelling of 255511421505 in words is "two hundred fifty-five billion, five hundred eleven million, four hundred twenty-one thousand, five hundred five".