66660570 has 160 divisors (see below), whose sum is σ = 195706368. Its totient is φ = 16215552.

The previous prime is 66660563. The next prime is 66660613. The reversal of 66660570 is 7506666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 647139 + ... + 647241.

Almost surely, 2^66660570 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66660570, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97853184).

66660570 is an abundant number, since it is smaller than the sum of its proper divisors (129045798).

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

66660570 is a wasteful number, since it uses less digits than its factorization.

66660570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186 (or 177 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

The square root of 66660570 is about 8164.5924576797. The cubic root of 66660570 is about 405.4677722754.

The spelling of 66660570 in words is "sixty-six million, six hundred sixty thousand, five hundred seventy".