166871718855 has 24 divisors (see below), whose sum is σ = 304467699120. Its totient is φ = 84314131200.

The previous prime is 166871718851. The next prime is 166871718859. The reversal of 166871718855 is 558817178661.

It is an interprime number because it is at equal distance from previous prime (166871718851) and next prime (166871718859).

It is not a de Polignac number, because 166871718855 - 2² = 166871718851 is a prime.

It is a super-2 number, since 2×166871718855² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 166871718792 and 166871718801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166871718851) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 97584946 + ... + 97586655.

It is an arithmetic number, because the mean of its divisors is an integer number (12686154130).

Almost surely, 2^166871718855 is an apocalyptic number.

166871718855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

166871718855 is a deficient number, since it is larger than the sum of its proper divisors (137595980265).

166871718855 is a wasteful number, since it uses less digits than its factorization.

166871718855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195171631 (or 195171628 counting only the distinct ones).

The product of its digits is 22579200, while the sum is 63.

The spelling of 166871718855 in words is "one hundred sixty-six billion, eight hundred seventy-one million, seven hundred eighteen thousand, eight hundred fifty-five".