661313371 has 8 divisors (see below), whose sum is σ = 664070400. Its totient is φ = 658563048.

The previous prime is 661313347. The next prime is 661313381. The reversal of 661313371 is 173313166.

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

It is a cyclic number.

It is not a de Polignac number, because 661313371 - 2⁵ = 661313339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (661313381) 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 7 ways as a sum of consecutive naturals, for example, 290580 + ... + 292846.

It is an arithmetic number, because the mean of its divisors is an integer number (83008800).

Almost surely, 2^661313371 is an apocalyptic number.

661313371 is a deficient number, since it is larger than the sum of its proper divisors (2757029).

661313371 is a wasteful number, since it uses less digits than its factorization.

661313371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3353.

The product of its digits is 6804, while the sum is 31.

The square root of 661313371 is about 25716.0139018472. The cubic root of 661313371 is about 871.2359106891.

The spelling of 661313371 in words is "six hundred sixty-one million, three hundred thirteen thousand, three hundred seventy-one".