255508017665 has 8 divisors (see below), whose sum is σ = 307418619840. Its totient is φ = 203867081712.

The previous prime is 255508017659. The next prime is 255508017697. The reversal of 255508017665 is 566710805552.

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

It is a cyclic number.

It is not a de Polignac number, because 255508017665 - 2⁴ = 255508017649 is a prime.

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, 67414469 + ... + 67418258.

It is an arithmetic number, because the mean of its divisors is an integer number (38427327480).

Almost surely, 2^255508017665 is an apocalyptic number.

It is an amenable number.

255508017665 is a deficient number, since it is larger than the sum of its proper divisors (51910602175).

255508017665 is a wasteful number, since it uses less digits than its factorization.

255508017665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134833111.

The product of its (nonzero) digits is 2520000, while the sum is 50.

The spelling of 255508017665 in words is "two hundred fifty-five billion, five hundred eight million, seventeen thousand, six hundred sixty-five".