660116556 has 72 divisors (see below), whose sum is σ = 1869560784. Its totient is φ = 194624640.

The previous prime is 660116539. The next prime is 660116591. The reversal of 660116556 is 655611066.

It is a super-2 number, since 2×660116556² = 871507735010602272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 660116556.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7875 + ... + 37178.

It is an arithmetic number, because the mean of its divisors is an integer number (25966122).

Almost surely, 2^660116556 is an apocalyptic number.

660116556 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

660116556 is an abundant number, since it is smaller than the sum of its proper divisors (1209444228).

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

660116556 is a wasteful number, since it uses less digits than its factorization.

660116556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45111 (or 45106 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 660116556 is about 25692.7335252596. The cubic root of 660116556 is about 870.7100188801.

The spelling of 660116556 in words is "six hundred sixty million, one hundred sixteen thousand, five hundred fifty-six".