665005366 has 16 divisors (see below), whose sum is σ = 1057518720. Its totient is φ = 313079040.

The previous prime is 665005361. The next prime is 665005381. The reversal of 665005366 is 663500566.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665005361) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142651 + ... + 147238.

It is an arithmetic number, because the mean of its divisors is an integer number (66094920).

Almost surely, 2^665005366 is an apocalyptic number.

665005366 is a deficient number, since it is larger than the sum of its proper divisors (392513354).

665005366 is a wasteful number, since it uses less digits than its factorization.

665005366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289959.

The product of its (nonzero) digits is 97200, while the sum is 37.

The square root of 665005366 is about 25787.6979585228. The cubic root of 665005366 is about 872.8542212432.

The spelling of 665005366 in words is "six hundred sixty-five million, five thousand, three hundred sixty-six".