255515995907 has 4 divisors (see below), whose sum is σ = 256036395576. Its totient is φ = 254995596240.

The previous prime is 255515995879. The next prime is 255515995963. The reversal of 255515995907 is 709599515552.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 255515995907 - 2²⁴ = 255499218691 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 255515995907.

It is not an unprimeable number, because it can be changed into a prime (255515995807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 260199098 + ... + 260200079.

It is an arithmetic number, because the mean of its divisors is an integer number (64009098894).

Almost surely, 2^255515995907 is an apocalyptic number.

255515995907 is a deficient number, since it is larger than the sum of its proper divisors (520399669).

255515995907 is an equidigital number, since it uses as much as digits as its factorization.

255515995907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520399668.

The product of its (nonzero) digits is 31893750, while the sum is 62.

The spelling of 255515995907 in words is "two hundred fifty-five billion, five hundred fifteen million, nine hundred ninety-five thousand, nine hundred seven".