666011346 has 192 divisors, whose sum is σ = 1911216384. Its totient is φ = 150036480.

The previous prime is 666011341. The next prime is 666011369. The reversal of 666011346 is 643110666.

666011346 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×666011346² = 887142226001463432, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (666011341) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1122826 + ... + 1123418.

It is an arithmetic number, because the mean of its divisors is an integer number (9954252).

Almost surely, 2^666011346 is an apocalyptic number.

666011346 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 666011346, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (955608192).

666011346 is an abundant number, since it is smaller than the sum of its proper divisors (1245205038).

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

666011346 is a wasteful number, since it uses less digits than its factorization.

666011346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 657 (or 646 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 666011346 is about 25807.1956244765. The cubic root of 666011346 is about 873.2941332300.

The spelling of 666011346 in words is "six hundred sixty-six million, eleven thousand, three hundred forty-six".