655625161 has 4 divisors (see below), whose sum is σ = 656086032. Its totient is φ = 655164292.

The previous prime is 655625141. The next prime is 655625167. The reversal of 655625161 is 161526556.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 655625161 - 2²⁷ = 521407433 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 655625161.

It is not an unprimeable number, because it can be changed into a prime (655625167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 228295 + ... + 231148.

It is an arithmetic number, because the mean of its divisors is an integer number (164021508).

Almost surely, 2^655625161 is an apocalyptic number.

It is an amenable number.

655625161 is a deficient number, since it is larger than the sum of its proper divisors (460871).

655625161 is a wasteful number, since it uses less digits than its factorization.

655625161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 460870.

The product of its digits is 54000, while the sum is 37.

The square root of 655625161 is about 25605.1784020342. The cubic root of 655625161 is about 868.7307695759.

The spelling of 655625161 in words is "six hundred fifty-five million, six hundred twenty-five thousand, one hundred sixty-one".