66808367171740 has 12 divisors (see below), whose sum is σ = 140297571060696. Its totient is φ = 26723346868688.

The previous prime is 66808367171723. The next prime is 66808367171753. The reversal of 66808367171740 is 4717176380866.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1670209179274 + ... + 1670209179313.

It is an arithmetic number, because the mean of its divisors is an integer number (11691464255058).

Almost surely, 2^{66808367171740} is an apocalyptic number.

It is an amenable number.

66808367171740 is an abundant number, since it is smaller than the sum of its proper divisors (73489203888956).

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

66808367171740 is a wasteful number, since it uses less digits than its factorization.

66808367171740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3340418358596 (or 3340418358594 counting only the distinct ones).

The product of its (nonzero) digits is 56899584, while the sum is 64.

The spelling of 66808367171740 in words is "sixty-six trillion, eight hundred eight billion, three hundred sixty-seven million, one hundred seventy-one thousand, seven hundred forty".