6345436369581 has 6 divisors (see below), whose sum is σ = 9165630311630. Its totient is φ = 4230290913048.

The previous prime is 6345436369577. The next prime is 6345436369603. The reversal of 6345436369581 is 1859636345436.

6345436369581 is a `hidden beast` number, since 6 + 3 + 4 + 5 + 43 + 6 + 3 + 6 + 9 + 581 = 666.

It can be written as a sum of positive squares in only one way, i.e., 4138339872681 + 2207096496900 = 2034291^2 + 1485630^2 .

It is not a de Polignac number, because 6345436369581 - 2² = 6345436369577 is a prime.

It is a super-2 number, since 2×6345436369581² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6345436364581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 352524242746 + ... + 352524242763.

Almost surely, 2^{6345436369581} is an apocalyptic number.

It is an amenable number.

6345436369581 is a deficient number, since it is larger than the sum of its proper divisors (2820193942049).

6345436369581 is a wasteful number, since it uses less digits than its factorization.

6345436369581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 705048485515 (or 705048485512 counting only the distinct ones).

The product of its digits is 167961600, while the sum is 63.

The spelling of 6345436369581 in words is "six trillion, three hundred forty-five billion, four hundred thirty-six million, three hundred sixty-nine thousand, five hundred eighty-one".