660066701621 has 8 divisors (see below), whose sum is σ = 664137063360. Its totient is φ = 655996594752.

The previous prime is 660066701579. The next prime is 660066701627. The reversal of 660066701621 is 126107660066.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 660066701621 - 2⁶ = 660066701557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660066701627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10303736 + ... + 10367598.

It is an arithmetic number, because the mean of its divisors is an integer number (83017132920).

Almost surely, 2^660066701621 is an apocalyptic number.

It is an amenable number.

660066701621 is a deficient number, since it is larger than the sum of its proper divisors (4070361739).

660066701621 is a wasteful number, since it uses less digits than its factorization.

660066701621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127435.

The product of its (nonzero) digits is 108864, while the sum is 41.

The spelling of 660066701621 in words is "six hundred sixty billion, sixty-six million, seven hundred one thousand, six hundred twenty-one".