66170344661 has 16 divisors (see below), whose sum is σ = 72743495040. Its totient is φ = 59910903360.

The previous prime is 66170344637. The next prime is 66170344673. The reversal of 66170344661 is 16644307166.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-66170344661 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 (66170344861) 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 15 ways as a sum of consecutive naturals, for example, 451991 + ... + 580203.

It is an arithmetic number, because the mean of its divisors is an integer number (4546468440).

Almost surely, 2^66170344661 is an apocalyptic number.

It is an amenable number.

66170344661 is a deficient number, since it is larger than the sum of its proper divisors (6573150379).

66170344661 is a wasteful number, since it uses less digits than its factorization.

66170344661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129436.

The product of its (nonzero) digits is 435456, while the sum is 44.

The spelling of 66170344661 in words is "sixty-six billion, one hundred seventy million, three hundred forty-four thousand, six hundred sixty-one".