3261565643503 has 16 divisors (see below), whose sum is σ = 3499396560000. Its totient is φ = 3028893184512.

The previous prime is 3261565643491. The next prime is 3261565643513. The reversal of 3261565643503 is 3053465651623.

It is a cyclic number.

It is not a de Polignac number, because 3261565643503 - 2⁵ = 3261565643471 is a prime.

It is a super-2 number, since 2×3261565643503² (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 (3261565643513) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1296393 + ... + 2864221.

It is an arithmetic number, because the mean of its divisors is an integer number (218712285000).

Almost surely, 2^{3261565643503} is an apocalyptic number.

3261565643503 is a deficient number, since it is larger than the sum of its proper divisors (237830916497).

3261565643503 is a wasteful number, since it uses less digits than its factorization.

3261565643503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1569474.

The product of its (nonzero) digits is 5832000, while the sum is 49.

The spelling of 3261565643503 in words is "three trillion, two hundred sixty-one billion, five hundred sixty-five million, six hundred forty-three thousand, five hundred three".