660584813 has 4 divisors (see below), whose sum is σ = 754954080. Its totient is φ = 566215548.

The previous prime is 660584809. The next prime is 660584839. The reversal of 660584813 is 318485066.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 660584813 - 2² = 660584809 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660584843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47184623 + ... + 47184636.

It is an arithmetic number, because the mean of its divisors is an integer number (188738520).

Almost surely, 2^660584813 is an apocalyptic number.

It is an amenable number.

660584813 is a deficient number, since it is larger than the sum of its proper divisors (94369267).

660584813 is an equidigital number, since it uses as much as digits as its factorization.

660584813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94369266.

The product of its (nonzero) digits is 138240, while the sum is 41.

The square root of 660584813 is about 25701.8445447015. The cubic root of 660584813 is about 870.9158510625.

The spelling of 660584813 in words is "six hundred sixty million, five hundred eighty-four thousand, eight hundred thirteen".