66662906573 has 8 divisors (see below), whose sum is σ = 67926246648. Its totient is φ = 65409030144.

The previous prime is 66662906539. The next prime is 66662906587. The reversal of 66662906573 is 37560926666.

It can be written as a sum of positive squares in 4 ways, for example, as 14076161449 + 52586745124 = 118643^2 + 229318^2 .

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 66662906573 - 2²² = 66658712269 is a prime.

It is a super-2 number, since 2×66662906573² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66662906533) 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, 2351690 + ... + 2379867.

It is an arithmetic number, because the mean of its divisors is an integer number (8490780831).

Almost surely, 2^66662906573 is an apocalyptic number.

It is an amenable number.

66662906573 is a deficient number, since it is larger than the sum of its proper divisors (1263340075).

66662906573 is a wasteful number, since it uses less digits than its factorization.

66662906573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4731823.

The product of its (nonzero) digits is 14696640, while the sum is 56.

The spelling of 66662906573 in words is "sixty-six billion, six hundred sixty-two million, nine hundred six thousand, five hundred seventy-three".