666161010 has 80 divisors (see below), whose sum is σ = 1799620416. Its totient is φ = 176811552.

The previous prime is 666160981. The next prime is 666161011. The reversal of 666161010 is 10161666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (666161011) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 182059 + ... + 185681.

Almost surely, 2^666161010 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666161010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (899810208).

666161010 is an abundant number, since it is smaller than the sum of its proper divisors (1133459406).

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

666161010 is a wasteful number, since it uses less digits than its factorization.

666161010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3869 (or 3860 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 666161010 is about 25810.0951179960. The cubic root of 666161010 is about 873.3595429787.

The spelling of 666161010 in words is "six hundred sixty-six million, one hundred sixty-one thousand, ten".