166785776345 has 32 divisors (see below), whose sum is σ = 216598905600. Its totient is φ = 122859991296.

The previous prime is 166785776341. The next prime is 166785776363. The reversal of 166785776345 is 543677587661.

It is a cyclic number.

It is not a de Polignac number, because 166785776345 - 2² = 166785776341 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166785776341) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3374471 + ... + 3423539.

It is an arithmetic number, because the mean of its divisors is an integer number (6768715800).

Almost surely, 2^166785776345 is an apocalyptic number.

It is an amenable number.

166785776345 is a deficient number, since it is larger than the sum of its proper divisors (49813129255).

166785776345 is a wasteful number, since it uses less digits than its factorization.

166785776345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50097.

The product of its digits is 177811200, while the sum is 65.

The spelling of 166785776345 in words is "one hundred sixty-six billion, seven hundred eighty-five million, seven hundred seventy-six thousand, three hundred forty-five".