166863158501 has 16 divisors (see below), whose sum is σ = 184949670528. Its totient is φ = 149591534400.

The previous prime is 166863158477. The next prime is 166863158507. The reversal of 166863158501 is 105851368661.

It is a cyclic number.

It is not a de Polignac number, because 166863158501 - 2⁶ = 166863158437 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166863158501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166863158507) 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, 1287290 + ... + 1410971.

It is an arithmetic number, because the mean of its divisors is an integer number (11559354408).

Almost surely, 2^166863158501 is an apocalyptic number.

It is an amenable number.

166863158501 is a deficient number, since it is larger than the sum of its proper divisors (18086512027).

166863158501 is a wasteful number, since it uses less digits than its factorization.

166863158501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2698412.

The product of its (nonzero) digits is 1036800, while the sum is 50.

The spelling of 166863158501 in words is "one hundred sixty-six billion, eight hundred sixty-three million, one hundred fifty-eight thousand, five hundred one".