666606516520 has 64 divisors (see below), whose sum is σ = 1731102710400. Its totient is φ = 226287916800.

The previous prime is 666606516497. The next prime is 666606516539. The reversal of 666606516520 is 25615606666.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11757550 + ... + 11814109.

It is an arithmetic number, because the mean of its divisors is an integer number (27048479850).

Almost surely, 2^666606516520 is an apocalyptic number.

It is an amenable number.

666606516520 is an abundant number, since it is smaller than the sum of its proper divisors (1064496193880).

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

666606516520 is a wasteful number, since it uses less digits than its factorization.

666606516520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23571778 (or 23571774 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 49.

The spelling of 666606516520 in words is "six hundred sixty-six billion, six hundred six million, five hundred sixteen thousand, five hundred twenty".