665970258 has 8 divisors (see below), whose sum is σ = 1331940528. Its totient is φ = 221990084.

The previous prime is 665970211. The next prime is 665970259. The reversal of 665970258 is 852079566.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

665970258 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (665970259) 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, 55497516 + ... + 55497527.

It is an arithmetic number, because the mean of its divisors is an integer number (166492566).

Almost surely, 2^665970258 is an apocalyptic number.

665970258 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665970258 is a wasteful number, since it uses less digits than its factorization.

665970258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110995048.

The product of its (nonzero) digits is 907200, while the sum is 48.

The square root of 665970258 is about 25806.3995551491. The cubic root of 665970258 is about 873.2761742531.

The spelling of 665970258 in words is "six hundred sixty-five million, nine hundred seventy thousand, two hundred fifty-eight".