5538953681 has 2 divisors, whose sum is σ = 5538953682. Its totient is φ = 5538953680.

The previous prime is 5538953591. The next prime is 5538953773. The reversal of 5538953681 is 1863598355.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3722830225 + 1816123456 = 61015^2 + 42616^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5538953681 is a prime.

It is a super-2 number, since 2×5538953681² = 61360015760526899522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (5538953881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2769476840 + 2769476841.

It is an arithmetic number, because the mean of its divisors is an integer number (2769476841).

Almost surely, 2^5538953681 is an apocalyptic number.

It is an amenable number.

5538953681 is a deficient number, since it is larger than the sum of its proper divisors (1).

5538953681 is an equidigital number, since it uses as much as digits as its factorization.

5538953681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888000, while the sum is 53.

The square root of 5538953681 is about 74424.1471634039. The cubic root of 5538953681 is about 1769.3316426009.

The spelling of 5538953681 in words is "five billion, five hundred thirty-eight million, nine hundred fifty-three thousand, six hundred eighty-one".