5681551865 has 16 divisors (see below), whose sum is σ = 7463969856. Its totient is φ = 4117425600.

The previous prime is 5681551819. The next prime is 5681551867.

It is a happy number.

5681551865 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 5681551865 - 2⁶ = 5681551801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5681551867) 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, 166946 + ... + 198075.

It is an arithmetic number, because the mean of its divisors is an integer number (466498116).

Almost surely, 2^5681551865 is an apocalyptic number.

5681551865 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

5681551865 is a deficient number, since it is larger than the sum of its proper divisors (1782417991).

5681551865 is a wasteful number, since it uses less digits than its factorization.

5681551865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365320.

The product of its digits is 1440000, while the sum is 50.

The square root of 5681551865 is about 75376.0695778176. The cubic root of 5681551865 is about 1784.3867587719.

The spelling of 5681551865 in words is "five billion, six hundred eighty-one million, five hundred fifty-one thousand, eight hundred sixty-five".