255551045561 has 8 divisors (see below), whose sum is σ = 292309472064. Its totient is φ = 218855402640.

The previous prime is 255551045549. The next prime is 255551045569. The reversal of 255551045561 is 165540155552.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-255551045561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (255551045569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15687170 + ... + 15703451.

It is an arithmetic number, because the mean of its divisors is an integer number (36538684008).

Almost surely, 2^255551045561 is an apocalyptic number.

It is an amenable number.

255551045561 is a deficient number, since it is larger than the sum of its proper divisors (36758426503).

255551045561 is a wasteful number, since it uses less digits than its factorization.

255551045561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31391791.

The product of its (nonzero) digits is 750000, while the sum is 44.

The spelling of 255551045561 in words is "two hundred fifty-five billion, five hundred fifty-one million, forty-five thousand, five hundred sixty-one".