3561737681 has 2 divisors, whose sum is σ = 3561737682. Its totient is φ = 3561737680.

The previous prime is 3561737579. The next prime is 3561737693. The reversal of 3561737681 is 1867371653.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3398307025 + 163430656 = 58295^2 + 12784^2 .

It is a cyclic number.

It is not a de Polignac number, because 3561737681 - 2³⁰ = 2487995857 is a prime.

It is a super-2 number, since 2×3561737681² = 25371950616510515522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3561737981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1780868840 + 1780868841.

It is an arithmetic number, because the mean of its divisors is an integer number (1780868841).

Almost surely, 2^3561737681 is an apocalyptic number.

It is an amenable number.

3561737681 is a deficient number, since it is larger than the sum of its proper divisors (1).

3561737681 is an equidigital number, since it uses as much as digits as its factorization.

3561737681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 635040, while the sum is 47.

The square root of 3561737681 is about 59680.2955840535. The cubic root of 3561737681 is about 1527.1697404241.

The spelling of 3561737681 in words is "three billion, five hundred sixty-one million, seven hundred thirty-seven thousand, six hundred eighty-one".