166667947776 has 864 divisors, whose sum is σ = 588189288960. Its totient is φ = 45140705280.

The previous prime is 166667947763. The next prime is 166667947867. The reversal of 166667947776 is 677749766661.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1199049915 + ... + 1199050053.

It is an arithmetic number, because the mean of its divisors is an integer number (680774640).

Almost surely, 2^166667947776 is an apocalyptic number.

166667947776 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166667947776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (294094644480).

166667947776 is an abundant number, since it is smaller than the sum of its proper divisors (421521341184).

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

166667947776 is a wasteful number, since it uses less digits than its factorization.

166667947776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234 (or 195 counting only the distinct ones).

The product of its digits is 672126336, while the sum is 72.

The spelling of 166667947776 in words is "one hundred sixty-six billion, six hundred sixty-seven million, nine hundred forty-seven thousand, seven hundred seventy-six".