665255061 has 24 divisors (see below), whose sum is σ = 990961920. Its totient is φ = 429824736.

The previous prime is 665255057. The next prime is 665255089. The reversal of 665255061 is 160552566.

It is a happy number.

It is not a de Polignac number, because 665255061 - 2² = 665255057 is a prime.

It is a super-2 number, since 2×665255061² = 885128592372227442, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665256061) 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, 35935 + ... + 51203.

It is an arithmetic number, because the mean of its divisors is an integer number (41290080).

Almost surely, 2^665255061 is an apocalyptic number.

It is an amenable number.

665255061 is a deficient number, since it is larger than the sum of its proper divisors (325706859).

665255061 is a wasteful number, since it uses less digits than its factorization.

665255061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15425 (or 15422 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

The square root of 665255061 is about 25792.5388630123. The cubic root of 665255061 is about 872.9634534757.

The spelling of 665255061 in words is "six hundred sixty-five million, two hundred fifty-five thousand, sixty-one".