5635530781681 has 2 divisors, whose sum is σ = 5635530781682. Its totient is φ = 5635530781680.

The previous prime is 5635530781631. The next prime is 5635530781691. The reversal of 5635530781681 is 1861870355365.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5528705742400 + 106825039281 = 2351320^2 + 326841^2 .

It is a cyclic number.

It is not a de Polignac number, because 5635530781681 - 2⁷ = 5635530781553 is a prime.

It is a super-2 number, since 2×5635530781681² (a number of 26 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (5635530781631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2817765390840 + 2817765390841.

It is an arithmetic number, because the mean of its divisors is an integer number (2817765390841).

Almost surely, 2^{5635530781681} is an apocalyptic number.

It is an amenable number.

5635530781681 is a deficient number, since it is larger than the sum of its proper divisors (1).

5635530781681 is an equidigital number, since it uses as much as digits as its factorization.

5635530781681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144000, while the sum is 58.

The spelling of 5635530781681 in words is "five trillion, six hundred thirty-five billion, five hundred thirty million, seven hundred eighty-one thousand, six hundred eighty-one".