66605170671 has 16 divisors (see below), whose sum is σ = 106264660320. Its totient is φ = 40987797120.

The previous prime is 66605170663. The next prime is 66605170721. The reversal of 66605170671 is 17607150666.

It is not a de Polignac number, because 66605170671 - 2³ = 66605170663 is a prime.

It is a super-2 number, since 2×66605170671² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66605170601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94878810 + ... + 94879511.

It is an arithmetic number, because the mean of its divisors is an integer number (6641541270).

Almost surely, 2^66605170671 is an apocalyptic number.

66605170671 is a deficient number, since it is larger than the sum of its proper divisors (39659489649).

66605170671 is a wasteful number, since it uses less digits than its factorization.

66605170671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189758343 (or 189758337 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 45.

The spelling of 66605170671 in words is "sixty-six billion, six hundred five million, one hundred seventy thousand, six hundred seventy-one".