660963966 has 16 divisors (see below), whose sum is σ = 1423614864. Its totient is φ = 203373504.

The previous prime is 660963937. The next prime is 660963983. The reversal of 660963966 is 669369066.

It is a super-3 number, since 3×660963966³ (a number of 27 digits) contains 333 as substring.

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, 4236871 + ... + 4237026.

It is an arithmetic number, because the mean of its divisors is an integer number (88975929).

Almost surely, 2^660963966 is an apocalyptic number.

660963966 is an abundant number, since it is smaller than the sum of its proper divisors (762650898).

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

660963966 is a wasteful number, since it uses less digits than its factorization.

660963966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8473915.

The product of its (nonzero) digits is 1889568, while the sum is 51.

The square root of 660963966 is about 25709.2194747332. The cubic root of 660963966 is about 871.0824444582.

The spelling of 660963966 in words is "six hundred sixty million, nine hundred sixty-three thousand, nine hundred sixty-six".