665213630 has 16 divisors (see below), whose sum is σ = 1197681120. Its totient is φ = 266019552.

The previous prime is 665213611. The next prime is 665213657. The reversal of 665213630 is 36312566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66092 + ... + 75488.

It is an arithmetic number, because the mean of its divisors is an integer number (74855070).

Almost surely, 2^665213630 is an apocalyptic number.

665213630 is a deficient number, since it is larger than the sum of its proper divisors (532467490).

665213630 is a wasteful number, since it uses less digits than its factorization.

665213630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16483.

The product of its (nonzero) digits is 19440, while the sum is 32.

The square root of 665213630 is about 25791.7356918839. The cubic root of 665213630 is about 872.9453308529.

The spelling of 665213630 in words is "six hundred sixty-five million, two hundred thirteen thousand, six hundred thirty".