660621066 has 16 divisors (see below), whose sum is σ = 1509991104. Its totient is φ = 188748864.

The previous prime is 660621041. The next prime is 660621077. The reversal of 660621066 is 660126066.

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, 7864495 + ... + 7864578.

It is an arithmetic number, because the mean of its divisors is an integer number (94374444).

Almost surely, 2^660621066 is an apocalyptic number.

660621066 is an abundant number, since it is smaller than the sum of its proper divisors (849370038).

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

660621066 is a wasteful number, since it uses less digits than its factorization.

660621066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15729085.

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 660621066 is about 25702.5497956915. The cubic root of 660621066 is about 870.9317827714.

It can be divided in two parts, 6606 and 21066, that added together give a palindrome (27672).

The spelling of 660621066 in words is "six hundred sixty million, six hundred twenty-one thousand, sixty-six".