166665456 has 60 divisors (see below), whose sum is σ = 467534808. Its totient is φ = 55423872.

The previous prime is 166665419. The next prime is 166665479. The reversal of 166665456 is 654566661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 74206 + ... + 76418.

Almost surely, 2^166665456 is an apocalyptic number.

166665456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

166665456 is an abundant number, since it is smaller than the sum of its proper divisors (300869352).

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

166665456 is a wasteful number, since it uses less digits than its factorization.

166665456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2750 (or 2741 counting only the distinct ones).

The product of its digits is 777600, while the sum is 45.

The square root of 166665456 is about 12909.8975983545. The cubic root of 166665456 is about 550.3198756348.

It can be divided in two parts, 16666 and 5456, that added together give a palindrome (22122).

The spelling of 166665456 in words is "one hundred sixty-six million, six hundred sixty-five thousand, four hundred fifty-six".