255505015 has 4 divisors (see below), whose sum is σ = 306606024. Its totient is φ = 204404008.

The previous prime is 255505013. The next prime is 255505021. The reversal of 255505015 is 510505552.

It is a happy number.

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 255505015 - 2¹ = 255505013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255505013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25550497 + ... + 25550506.

It is an arithmetic number, because the mean of its divisors is an integer number (76651506).

Almost surely, 2^255505015 is an apocalyptic number.

255505015 is a deficient number, since it is larger than the sum of its proper divisors (51101009).

255505015 is an equidigital number, since it uses as much as digits as its factorization.

255505015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51101008.

The product of its (nonzero) digits is 6250, while the sum is 28.

The square root of 255505015 is about 15984.5242343962. The cubic root of 255505015 is about 634.5509173118.

The spelling of 255505015 in words is "two hundred fifty-five million, five hundred five thousand, fifteen".