166851868655 has 8 divisors (see below), whose sum is σ = 200224688832. Its totient is φ = 133479863968.

The previous prime is 166851868639. The next prime is 166851868657. The reversal of 166851868655 is 556868158661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 166851868655 - 2⁴ = 166851868639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166851868591 and 166851868600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166851868657) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 419594 + ... + 713976.

It is an arithmetic number, because the mean of its divisors is an integer number (25028086104).

Almost surely, 2^166851868655 is an apocalyptic number.

166851868655 is a deficient number, since it is larger than the sum of its proper divisors (33372820177).

166851868655 is a wasteful number, since it uses less digits than its factorization.

166851868655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407745.

The product of its digits is 82944000, while the sum is 65.

The spelling of 166851868655 in words is "one hundred sixty-six billion, eight hundred fifty-one million, eight hundred sixty-eight thousand, six hundred fifty-five".