661797316 has 12 divisors (see below), whose sum is σ = 1159256700. Its totient is φ = 330581120.

The previous prime is 661797307. The next prime is 661797317. The reversal of 661797316 is 613797166.

661797316 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 580617216 + 81180100 = 24096^2 + 9010^2 .

It is not an unprimeable number, because it can be changed into a prime (661797317) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74665 + ... + 83056.

It is an arithmetic number, because the mean of its divisors is an integer number (96604725).

Almost surely, 2^661797316 is an apocalyptic number.

It is an amenable number.

661797316 is a deficient number, since it is larger than the sum of its proper divisors (497459384).

661797316 is a wasteful number, since it uses less digits than its factorization.

661797316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158774 (or 158772 counting only the distinct ones).

The product of its digits is 285768, while the sum is 46.

The square root of 661797316 is about 25725.4215903258. The cubic root of 661797316 is about 871.4483805379.

The spelling of 661797316 in words is "six hundred sixty-one million, seven hundred ninety-seven thousand, three hundred sixteen".