660612020 has 12 divisors (see below), whose sum is σ = 1387285284. Its totient is φ = 264244800.

The previous prime is 660611999. The next prime is 660612031. The reversal of 660612020 is 20216066.

It can be written as a sum of positive squares in 2 ways, for example, as 114361636 + 546250384 = 10694^2 + 23372^2 .

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 16515281 + ... + 16515320.

It is an arithmetic number, because the mean of its divisors is an integer number (115607107).

Almost surely, 2^660612020 is an apocalyptic number.

It is an amenable number.

660612020 is an abundant number, since it is smaller than the sum of its proper divisors (726673264).

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

660612020 is a wasteful number, since it uses less digits than its factorization.

660612020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33030610 (or 33030608 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 660612020 is about 25702.3738203303. The cubic root of 660612020 is about 870.9278074794.

Adding to 660612020 its reverse (20216066), we get a palindrome (680828086).

The spelling of 660612020 in words is "six hundred sixty million, six hundred twelve thousand, twenty".