56816180989 has 4 divisors (see below), whose sum is σ = 56866506460. Its totient is φ = 56765855520.

The previous prime is 56816180987. The next prime is 56816181001. The reversal of 56816180989 is 98908161865.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98908161865 = 5 ⋅19781632373.

It can be written as a sum of positive squares in 2 ways, for example, as 4427837764 + 52388343225 = 66542^2 + 228885^2 .

It is a cyclic number.

It is not a de Polignac number, because 56816180989 - 2¹ = 56816180987 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 (56816180987) 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, 25161042 + ... + 25163299.

It is an arithmetic number, because the mean of its divisors is an integer number (14216626615).

Almost surely, 2^56816180989 is an apocalyptic number.

It is an amenable number.

56816180989 is a deficient number, since it is larger than the sum of its proper divisors (50325471).

56816180989 is a wasteful number, since it uses less digits than its factorization.

56816180989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50325470.

The product of its (nonzero) digits is 7464960, while the sum is 61.

The spelling of 56816180989 in words is "fifty-six billion, eight hundred sixteen million, one hundred eighty thousand, nine hundred eighty-nine".