661327316 has 24 divisors (see below), whose sum is σ = 1260360360. Its totient is φ = 301796352.

The previous prime is 661327313. The next prime is 661327327. The reversal of 661327316 is 613723166.

It can be written as a sum of positive squares in 4 ways, for example, as 65772100 + 595555216 = 8110^2 + 24404^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661327313) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66821 + ... + 76076.

It is an arithmetic number, because the mean of its divisors is an integer number (52515015).

Almost surely, 2^661327316 is an apocalyptic number.

It is an amenable number.

661327316 is a deficient number, since it is larger than the sum of its proper divisors (599033044).

661327316 is a wasteful number, since it uses less digits than its factorization.

661327316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143003 (or 143001 counting only the distinct ones).

The product of its digits is 27216, while the sum is 35.

The square root of 661327316 is about 25716.2850349735. The cubic root of 661327316 is about 871.2420345128.

The spelling of 661327316 in words is "six hundred sixty-one million, three hundred twenty-seven thousand, three hundred sixteen".