166666265040 has 320 divisors, whose sum is σ = 571320076032. Its totient is φ = 39856128000.

The previous prime is 166666265021. The next prime is 166666265041. The reversal of 166666265040 is 40562666661.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166666265041) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 83457322 + ... + 83459318.

Almost surely, 2^166666265040 is an apocalyptic number.

166666265040 is a gapful number since it is divisible by the number (10) 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 166666265040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (285660038016).

166666265040 is an abundant number, since it is smaller than the sum of its proper divisors (404653810992).

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

166666265040 is a wasteful number, since it uses less digits than its factorization.

166666265040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2438 (or 2432 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 48.

The spelling of 166666265040 in words is "one hundred sixty-six billion, six hundred sixty-six million, two hundred sixty-five thousand, forty".