660063986 has 8 divisors (see below), whose sum is σ = 994239360. Its totient is φ = 328650868.

The previous prime is 660063941. The next prime is 660063991. The reversal of 660063986 is 689360066.

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

It is a super-2 number, since 2×660063986² = 871368931228416392, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 689966 + ... + 690921.

It is an arithmetic number, because the mean of its divisors is an integer number (124279920).

Almost surely, 2^660063986 is an apocalyptic number.

660063986 is a deficient number, since it is larger than the sum of its proper divisors (334175374).

660063986 is a wasteful number, since it uses less digits than its factorization.

660063986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1381128.

The product of its (nonzero) digits is 279936, while the sum is 44.

The square root of 660063986 is about 25691.7104529846. The cubic root of 660063986 is about 870.6869045576.

The spelling of 660063986 in words is "six hundred sixty million, sixty-three thousand, nine hundred eighty-six".