666732916 has 24 divisors (see below), whose sum is σ = 1181587176. Its totient is φ = 329155200.

The previous prime is 666732887. The next prime is 666732917. The reversal of 666732916 is 619237666.

It can be written as a sum of positive squares in 4 ways, for example, as 309900816 + 356832100 = 17604^2 + 18890^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666732917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 158310 + ... + 162466.

It is an arithmetic number, because the mean of its divisors is an integer number (49232799).

Almost surely, 2^666732916 is an apocalyptic number.

It is an amenable number.

666732916 is a deficient number, since it is larger than the sum of its proper divisors (514854260).

666732916 is a wasteful number, since it uses less digits than its factorization.

666732916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4659 (or 4657 counting only the distinct ones).

The product of its digits is 489888, while the sum is 46.

The square root of 666732916 is about 25821.1718556691. The cubic root of 666732916 is about 873.6094008395.

The spelling of 666732916 in words is "six hundred sixty-six million, seven hundred thirty-two thousand, nine hundred sixteen".