660066701620 has 24 divisors (see below), whose sum is σ = 1386747858888. Its totient is φ = 263910912000.

The previous prime is 660066701579. The next prime is 660066701627. The reversal of 660066701620 is 26107660066.

It can be written as a sum of positive squares in 4 ways, for example, as 186452967204 + 473613734416 = 431802^2 + 688196^2 .

It is a super-2 number, since 2×660066701620² (a number of 24 digits) contains 22 as substring.

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 polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7188781 + ... + 7280020.

It is an arithmetic number, because the mean of its divisors is an integer number (57781160787).

Almost surely, 2^660066701620 is an apocalyptic number.

It is an amenable number.

660066701620 is an abundant number, since it is smaller than the sum of its proper divisors (726681157268).

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

660066701620 is a wasteful number, since it uses less digits than its factorization.

660066701620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14471091 (or 14471089 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 40.

The spelling of 660066701620 in words is "six hundred sixty billion, sixty-six million, seven hundred one thousand, six hundred twenty".