665799969610 has 12 divisors (see below), whose sum is σ = 1198444589874. Its totient is φ = 266318955720.

The previous prime is 665799969599. The next prime is 665799969613. The reversal of 665799969610 is 16969997566.

It can be written as a sum of positive squares in only one way, i.e., 599219972649 + 66579996961 = 774093^2 + 258031^2 .

It is not an unprimeable number, because it can be changed into a prime (665799969613) 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 5 ways as a sum of consecutive naturals, for example, 2451295 + ... + 2709325.

Almost surely, 2^665799969610 is an apocalyptic number.

665799969610 is a deficient number, since it is larger than the sum of its proper divisors (532644620264).

665799969610 is an frugal number, since it uses more digits than its factorization.

665799969610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516069 (or 258038 counting only the distinct ones).

The product of its (nonzero) digits is 297606960, while the sum is 73.

The spelling of 665799969610 in words is "six hundred sixty-five billion, seven hundred ninety-nine million, nine hundred sixty-nine thousand, six hundred ten".