655409775 has 24 divisors (see below), whose sum is σ = 1093751424. Its totient is φ = 346280800.

The previous prime is 655409747. The next prime is 655409779. The reversal of 655409775 is 577904556.

It is not a de Polignac number, because 655409775 - 2⁵ = 655409743 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655409779) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32811 + ... + 48860.

It is an arithmetic number, because the mean of its divisors is an integer number (45572976).

Almost surely, 2^655409775 is an apocalyptic number.

655409775 is a deficient number, since it is larger than the sum of its proper divisors (438341649).

655409775 is a wasteful number, since it uses less digits than its factorization.

655409775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81791 (or 81786 counting only the distinct ones).

The product of its (nonzero) digits is 1323000, while the sum is 48.

The square root of 655409775 is about 25600.9721495103. The cubic root of 655409775 is about 868.6356273358.

The spelling of 655409775 in words is "six hundred fifty-five million, four hundred nine thousand, seven hundred seventy-five".