661166214 has 32 divisors (see below), whose sum is σ = 1345921920. Its totient is φ = 216487872.

The previous prime is 661166201. The next prime is 661166221. The reversal of 661166214 is 412661166.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 85434 + ... + 92850.

It is an arithmetic number, because the mean of its divisors is an integer number (42060060).

Almost surely, 2^661166214 is an apocalyptic number.

661166214 is an abundant number, since it is smaller than the sum of its proper divisors (684755706).

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

661166214 is a wasteful number, since it uses less digits than its factorization.

661166214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7684.

The product of its digits is 10368, while the sum is 33.

The square root of 661166214 is about 25713.1525488416. The cubic root of 661166214 is about 871.1712827435.

The spelling of 661166214 in words is "six hundred sixty-one million, one hundred sixty-six thousand, two hundred fourteen".