660621012 has 24 divisors (see below), whose sum is σ = 1558771200. Its totient is φ = 217732416.

The previous prime is 660621001. The next prime is 660621023. The reversal of 660621012 is 210126066.

It is an interprime number because it is at equal distance from previous prime (660621001) and next prime (660621023).

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 7 ways as a sum of consecutive naturals, for example, 308212 + ... + 310347.

It is an arithmetic number, because the mean of its divisors is an integer number (64948800).

Almost surely, 2^660621012 is an apocalyptic number.

It is an amenable number.

660621012 is an abundant number, since it is smaller than the sum of its proper divisors (898150188).

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

660621012 is a wasteful number, since it uses less digits than its factorization.

660621012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 618655 (or 618653 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 660621012 is about 25702.5487452120. The cubic root of 660621012 is about 870.9317590411.

Adding to 660621012 its reverse (210126066), we get a palindrome (870747078).

The spelling of 660621012 in words is "six hundred sixty million, six hundred twenty-one thousand, twelve".