3523611564581 has 2 divisors, whose sum is σ = 3523611564582. Its totient is φ = 3523611564580.

The previous prime is 3523611564559. The next prime is 3523611564601. The reversal of 3523611564581 is 1854651163253.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2003260913956 + 1520350650625 = 1415366^2 + 1233025^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3523611564581 is a prime.

It is a super-2 number, since 2×3523611564581² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3523611564511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1761805782290 + 1761805782291.

It is an arithmetic number, because the mean of its divisors is an integer number (1761805782291).

Almost surely, 2^{3523611564581} is an apocalyptic number.

It is an amenable number.

3523611564581 is a deficient number, since it is larger than the sum of its proper divisors (1).

3523611564581 is an equidigital number, since it uses as much as digits as its factorization.

3523611564581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592000, while the sum is 50.

The spelling of 3523611564581 in words is "three trillion, five hundred twenty-three billion, six hundred eleven million, five hundred sixty-four thousand, five hundred eighty-one".