66694946761608 has 32 divisors (see below), whose sum is σ = 181895309350560. Its totient is φ = 20210589927680.

The previous prime is 66694946761607. The next prime is 66694946761679. The reversal of 66694946761608 is 80616764949666.

It is not an unprimeable number, because it can be changed into a prime (66694946761607) 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, 126316186785 + ... + 126316187312.

It is an arithmetic number, because the mean of its divisors is an integer number (5684228417205).

Almost surely, 2^{66694946761608} is an apocalyptic number.

It is an amenable number.

66694946761608 is an abundant number, since it is smaller than the sum of its proper divisors (115200362588952).

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

66694946761608 is a wasteful number, since it uses less digits than its factorization.

66694946761608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252632374117 (or 252632374113 counting only the distinct ones).

The product of its (nonzero) digits is 3386105856, while the sum is 78.

The spelling of 66694946761608 in words is "sixty-six trillion, six hundred ninety-four billion, nine hundred forty-six million, seven hundred sixty-one thousand, six hundred eight".