56611278581 has 16 divisors (see below), whose sum is σ = 66515225280. Its totient is φ = 47501061120.

The previous prime is 56611278571. The next prime is 56611278593. The reversal of 56611278581 is 18587211665.

It is a cyclic number.

It is not a de Polignac number, because 56611278581 - 2⁶ = 56611278517 is a prime.

It is a super-2 number, since 2×56611278581² (a number of 22 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 (56611278511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2238101 + ... + 2263253.

It is an arithmetic number, because the mean of its divisors is an integer number (4157201580).

Almost surely, 2^56611278581 is an apocalyptic number.

It is an amenable number.

56611278581 is a deficient number, since it is larger than the sum of its proper divisors (9903946699).

56611278581 is a wasteful number, since it uses less digits than its factorization.

56611278581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40916.

The product of its digits is 806400, while the sum is 50.

The spelling of 56611278581 in words is "fifty-six billion, six hundred eleven million, two hundred seventy-eight thousand, five hundred eighty-one".