56651615569 has 8 divisors (see below), whose sum is σ = 56753290440. Its totient is φ = 56550014976.

The previous prime is 56651615509. The next prime is 56651615597. The reversal of 56651615569 is 96551615665.

It can be written as a sum of positive squares in 4 ways, for example, as 7506489600 + 49145125969 = 86640^2 + 221687^2 .

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 56651615569 - 2¹¹ = 56651613521 is a prime.

It is a super-2 number, since 2×56651615569² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56651615509) 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, 1638549 + ... + 1672765.

It is an arithmetic number, because the mean of its divisors is an integer number (7094161305).

Almost surely, 2^56651615569 is an apocalyptic number.

It is an amenable number.

56651615569 is a deficient number, since it is larger than the sum of its proper divisors (101674871).

56651615569 is a wasteful number, since it uses less digits than its factorization.

56651615569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37139.

The product of its digits is 7290000, while the sum is 55.

It can be divided in two parts, 56651 and 615569, that added together give a triangular number (672220 = T₁₁₅₉).

The spelling of 56651615569 in words is "fifty-six billion, six hundred fifty-one million, six hundred fifteen thousand, five hundred sixty-nine".