166863158551 has 16 divisors (see below), whose sum is σ = 180145114560. Its totient is φ = 154084860160.

The previous prime is 166863158513. The next prime is 166863158573. The reversal of 166863158551 is 155851368661.

It is not a de Polignac number, because 166863158551 - 2¹⁵ = 166863125783 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166863158492 and 166863158501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166863158851) 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, 9270981 + ... + 9288961.

It is an arithmetic number, because the mean of its divisors is an integer number (11259069660).

Almost surely, 2^166863158551 is an apocalyptic number.

166863158551 is a deficient number, since it is larger than the sum of its proper divisors (13281956009).

166863158551 is a wasteful number, since it uses less digits than its factorization.

166863158551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31946.

The product of its digits is 5184000, while the sum is 55.

The spelling of 166863158551 in words is "one hundred sixty-six billion, eight hundred sixty-three million, one hundred fifty-eight thousand, five hundred fifty-one".