665666270 has 16 divisors (see below), whose sum is σ = 1209193920. Its totient is φ = 263823264.

The previous prime is 665666269. The next prime is 665666279. The reversal of 665666270 is 72666566.

It is a super-2 number, since 2×665666270² = 886223166031425800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665666279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 304262 + ... + 306441.

It is an arithmetic number, because the mean of its divisors is an integer number (75574620).

Almost surely, 2^665666270 is an apocalyptic number.

665666270 is a deficient number, since it is larger than the sum of its proper divisors (543527650).

665666270 is a wasteful number, since it uses less digits than its factorization.

665666270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610819.

The product of its (nonzero) digits is 544320, while the sum is 44.

The square root of 665666270 is about 25800.5091035041. The cubic root of 665666270 is about 873.1432824930.

The spelling of 665666270 in words is "six hundred sixty-five million, six hundred sixty-six thousand, two hundred seventy".