5681620361 has 2 divisors, whose sum is σ = 5681620362. Its totient is φ = 5681620360.

The previous prime is 5681620277. The next prime is 5681620381. The reversal of 5681620361 is 1630261865.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3826164736 + 1855455625 = 61856^2 + 43075^2 .

It is a cyclic number.

It is not a de Polignac number, because 5681620361 - 2²² = 5677426057 is a prime.

It is not a weakly prime, because it can be changed into another prime (5681620381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2840810180 + 2840810181.

It is an arithmetic number, because the mean of its divisors is an integer number (2840810181).

Almost surely, 2^5681620361 is an apocalyptic number.

It is an amenable number.

5681620361 is a deficient number, since it is larger than the sum of its proper divisors (1).

5681620361 is an equidigital number, since it uses as much as digits as its factorization.

5681620361 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 5681620361 is about 75376.5239381600. The cubic root of 5681620361 is about 1784.3939295160.

It can be divided in two parts, 56816 and 20361, that added together give a palindrome (77177).

The spelling of 5681620361 in words is "five billion, six hundred eighty-one million, six hundred twenty thousand, three hundred sixty-one".