661802965317 has 24 divisors (see below), whose sum is σ = 1037577375744. Its totient is φ = 404056556064.

The previous prime is 661802965309. The next prime is 661802965319. The reversal of 661802965317 is 713569208166.

661802965317 is a `hidden beast` number, since 6 + 6 + 1 + 80 + 29 + 6 + 531 + 7 = 666.

It is not a de Polignac number, because 661802965317 - 2³ = 661802965309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661802965319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22254573 + ... + 22284290.

It is an arithmetic number, because the mean of its divisors is an integer number (43232390656).

Almost surely, 2^661802965317 is an apocalyptic number.

It is an amenable number.

661802965317 is a deficient number, since it is larger than the sum of its proper divisors (375774410427).

661802965317 is a wasteful number, since it uses less digits than its factorization.

661802965317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44539009 (or 44539006 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 54.

The spelling of 661802965317 in words is "six hundred sixty-one billion, eight hundred two million, nine hundred sixty-five thousand, three hundred seventeen".