666665160 has 128 divisors (see below), whose sum is σ = 2406067200. Its totient is φ = 144357120.

The previous prime is 666665159. The next prime is 666665161. The reversal of 666665160 is 61566666.

It is an interprime number because it is at equal distance from previous prime (666665159) and next prime (666665161).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (666665161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4926 + ... + 36845.

It is an arithmetic number, because the mean of its divisors is an integer number (18797400).

Almost surely, 2^666665160 is an apocalyptic number.

666665160 is a gapful number since it is divisible by the number (60) 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 666665160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1203033600).

666665160 is an abundant number, since it is smaller than the sum of its proper divisors (1739402040).

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

666665160 is a wasteful number, since it uses less digits than its factorization.

666665160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41811 (or 41807 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 42.

The square root of 666665160 is about 25819.8597982251. The cubic root of 666665160 is about 873.5798066385.

The spelling of 666665160 in words is "six hundred sixty-six million, six hundred sixty-five thousand, one hundred sixty".