656061409813 has 8 divisors (see below), whose sum is σ = 659713743416. Its totient is φ = 652409380800.

The previous prime is 656061409807. The next prime is 656061409831. The reversal of 656061409813 is 318904160656.

It can be written as a sum of positive squares in 4 ways, for example, as 1219546084 + 654841863729 = 34922^2 + 809223^2 .

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 656061409813 - 2²⁹ = 655524538901 is a prime.

It is a super-2 number, since 2×656061409813² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656061409313) 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, 5292895 + ... + 5415427.

It is an arithmetic number, because the mean of its divisors is an integer number (82464217927).

Almost surely, 2^656061409813 is an apocalyptic number.

It is an amenable number.

656061409813 is a deficient number, since it is larger than the sum of its proper divisors (3652333603).

656061409813 is a wasteful number, since it uses less digits than its factorization.

656061409813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152295.

The product of its (nonzero) digits is 933120, while the sum is 49.

The spelling of 656061409813 in words is "six hundred fifty-six billion, sixty-one million, four hundred nine thousand, eight hundred thirteen".