661717313 has 8 divisors (see below), whose sum is σ = 696904800. Its totient is φ = 626565888.

The previous prime is 661717307. The next prime is 661717321. The reversal of 661717313 is 313717166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 661717313 - 2⁶ = 661717249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (661717363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33953 + ... + 49761.

It is an arithmetic number, because the mean of its divisors is an integer number (87113100).

Almost surely, 2^661717313 is an apocalyptic number.

It is an amenable number.

661717313 is a deficient number, since it is larger than the sum of its proper divisors (35187487).

661717313 is a wasteful number, since it uses less digits than its factorization.

661717313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18031.

The product of its digits is 15876, while the sum is 35.

The square root of 661717313 is about 25723.8666028263. The cubic root of 661717313 is about 871.4132633942.

The spelling of 661717313 in words is "six hundred sixty-one million, seven hundred seventeen thousand, three hundred thirteen".