661337313 has 64 divisors (see below), whose sum is σ = 1162291200. Its totient is φ = 324725760.

The previous prime is 661337311. The next prime is 661337321. The reversal of 661337313 is 313733166.

It is not a de Polignac number, because 661337313 - 2¹ = 661337311 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (661337311) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 304953 + ... + 307113.

It is an arithmetic number, because the mean of its divisors is an integer number (18160800).

Almost surely, 2^661337313 is an apocalyptic number.

It is an amenable number.

661337313 is a deficient number, since it is larger than the sum of its proper divisors (500953887).

661337313 is a wasteful number, since it uses less digits than its factorization.

661337313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2262.

The product of its digits is 20412, while the sum is 33.

The square root of 661337313 is about 25716.4794052374. The cubic root of 661337313 is about 871.2464245541.

The spelling of 661337313 in words is "six hundred sixty-one million, three hundred thirty-seven thousand, three hundred thirteen".