166872581815 has 8 divisors (see below), whose sum is σ = 202311501840. Its totient is φ = 132121796352.

The previous prime is 166872581809. The next prime is 166872581819. The reversal of 166872581815 is 518185278661.

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 166872581815 - 2¹⁵ = 166872549047 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166872581815.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166872581819) 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, 172033105 + ... + 172034074.

It is an arithmetic number, because the mean of its divisors is an integer number (25288937730).

Almost surely, 2^166872581815 is an apocalyptic number.

166872581815 is a deficient number, since it is larger than the sum of its proper divisors (35438920025).

166872581815 is an equidigital number, since it uses as much as digits as its factorization.

166872581815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344067281.

The product of its digits is 6451200, while the sum is 58.

The spelling of 166872581815 in words is "one hundred sixty-six billion, eight hundred seventy-two million, five hundred eighty-one thousand, eight hundred fifteen".