166159840 has 96 divisors (see below), whose sum is σ = 489452544. Its totient is φ = 51786240.

The previous prime is 166159837. The next prime is 166159849. The reversal of 166159840 is 48951661.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 166159793 and 166159802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166159849) 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, 5577 + ... + 19063.

It is an arithmetic number, because the mean of its divisors is an integer number (5098464).

Almost surely, 2^166159840 is an apocalyptic number.

166159840 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 166159840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (244726272).

166159840 is an abundant number, since it is smaller than the sum of its proper divisors (323292704).

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

166159840 is a wasteful number, since it uses less digits than its factorization.

166159840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13520 (or 13512 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 166159840 is about 12890.3002292421. The cubic root of 166159840 is about 549.7628068136.

The spelling of 166159840 in words is "one hundred sixty-six million, one hundred fifty-nine thousand, eight hundred forty".