166665552 has 80 divisors (see below), whose sum is σ = 471666240. Its totient is φ = 50477056.

The previous prime is 166665539. The next prime is 166665557. The reversal of 166665552 is 255566661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166665557) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20143 + ... + 27185.

It is an arithmetic number, because the mean of its divisors is an integer number (5895828).

Almost surely, 2^166665552 is an apocalyptic number.

166665552 is a gapful number since it is divisible by the number (12) 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 166665552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (235833120).

166665552 is an abundant number, since it is smaller than the sum of its proper divisors (305000688).

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

166665552 is a wasteful number, since it uses less digits than its factorization.

166665552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7100 (or 7094 counting only the distinct ones).

The product of its digits is 324000, while the sum is 42.

The square root of 166665552 is about 12909.9013164315. The cubic root of 166665552 is about 550.3199812970.

The spelling of 166665552 in words is "one hundred sixty-six million, six hundred sixty-five thousand, five hundred fifty-two".