166851868654 has 8 divisors (see below), whose sum is σ = 250280054208. Its totient is φ = 83425183920.

The previous prime is 166851868639. The next prime is 166851868657. The reversal of 166851868654 is 456868158661.

It is a happy number.

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

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 pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35902 + ... + 578785.

It is an arithmetic number, because the mean of its divisors is an integer number (31285006776).

Almost surely, 2^166851868654 is an apocalyptic number.

166851868654 is a deficient number, since it is larger than the sum of its proper divisors (83428185554).

166851868654 is a wasteful number, since it uses less digits than its factorization.

166851868654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 750410.

The product of its digits is 66355200, while the sum is 64.

The spelling of 166851868654 in words is "one hundred sixty-six billion, eight hundred fifty-one million, eight hundred sixty-eight thousand, six hundred fifty-four".