166728669612 has 12 divisors (see below), whose sum is σ = 389033562456. Its totient is φ = 55576223200.

The previous prime is 166728669587. The next prime is 166728669637. The reversal of 166728669612 is 216966827661.

It is an interprime number because it is at equal distance from previous prime (166728669587) and next prime (166728669637).

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6947027889 + ... + 6947027912.

It is an arithmetic number, because the mean of its divisors is an integer number (32419463538).

Almost surely, 2^166728669612 is an apocalyptic number.

166728669612 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

166728669612 is an abundant number, since it is smaller than the sum of its proper divisors (222304892844).

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

166728669612 is a wasteful number, since it uses less digits than its factorization.

166728669612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13894055808 (or 13894055806 counting only the distinct ones).

The product of its digits is 15676416, while the sum is 60.

The spelling of 166728669612 in words is "one hundred sixty-six billion, seven hundred twenty-eight million, six hundred sixty-nine thousand, six hundred twelve".