166666851558 has 16 divisors (see below), whose sum is σ = 370370781360. Its totient is φ = 55555617168.

The previous prime is 166666851557. The next prime is 166666851563. The reversal of 166666851558 is 855158666661.

It is a junction number, because it is equal to n+sod(n) for n = 166666851495 and 166666851504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166666851553) 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, 1543211535 + ... + 1543211642.

It is an arithmetic number, because the mean of its divisors is an integer number (23148173835).

Almost surely, 2^166666851558 is an apocalyptic number.

166666851558 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

166666851558 is an abundant number, since it is smaller than the sum of its proper divisors (203703929802).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166666851558 is a wasteful number, since it uses less digits than its factorization.

166666851558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3086423188 (or 3086423182 counting only the distinct ones).

The product of its digits is 62208000, while the sum is 63.

The spelling of 166666851558 in words is "one hundred sixty-six billion, six hundred sixty-six million, eight hundred fifty-one thousand, five hundred fifty-eight".