656545013 has 8 divisors (see below), whose sum is σ = 683586456. Its totient is φ = 630028800.

The previous prime is 656545003. The next prime is 656545031. The reversal of 656545013 is 310545656.

It can be written as a sum of positive squares in 4 ways, for example, as 4355569 + 652189444 = 2087^2 + 25538^2 .

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 656545013 - 2⁴ = 656544997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656545003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128756 + ... + 133757.

It is an arithmetic number, because the mean of its divisors is an integer number (85448307).

Almost surely, 2^656545013 is an apocalyptic number.

It is an amenable number.

656545013 is a deficient number, since it is larger than the sum of its proper divisors (27041443).

656545013 is a wasteful number, since it uses less digits than its factorization.

656545013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262615.

The product of its (nonzero) digits is 54000, while the sum is 35.

The square root of 656545013 is about 25623.1343320836. The cubic root of 656545013 is about 869.1368605133.

The spelling of 656545013 in words is "six hundred fifty-six million, five hundred forty-five thousand, thirteen".