5637709681 has 2 divisors, whose sum is σ = 5637709682. Its totient is φ = 5637709680.

The previous prime is 5637709667. The next prime is 5637709729. The reversal of 5637709681 is 1869077365.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5043130225 + 594579456 = 71015^2 + 24384^2 .

It is a cyclic number.

It is not a de Polignac number, because 5637709681 - 2⁹ = 5637709169 is a prime.

It is a super-2 number, since 2×5637709681² = 63567540894482243522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (5637709981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2818854840 + 2818854841.

It is an arithmetic number, because the mean of its divisors is an integer number (2818854841).

Almost surely, 2^5637709681 is an apocalyptic number.

It is an amenable number.

5637709681 is a deficient number, since it is larger than the sum of its proper divisors (1).

5637709681 is an equidigital number, since it uses as much as digits as its factorization.

5637709681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1905120, while the sum is 52.

The square root of 5637709681 is about 75084.6833981472. The cubic root of 5637709681 is about 1779.7851107207.

The spelling of 5637709681 in words is "five billion, six hundred thirty-seven million, seven hundred nine thousand, six hundred eighty-one".