3261566571557 has 12 divisors (see below), whose sum is σ = 3993754986720. Its totient is φ = 2648490147576.

The previous prime is 3261566571547. The next prime is 3261566571581. The reversal of 3261566571557 is 7551756651623.

It is not a de Polignac number, because 3261566571557 - 2⁴ = 3261566571541 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3261566571496 and 3261566571505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3261566571547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1751645993 + ... + 1751647854.

It is an arithmetic number, because the mean of its divisors is an integer number (332812915560).

Almost surely, 2^{3261566571557} is an apocalyptic number.

It is an amenable number.

3261566571557 is a deficient number, since it is larger than the sum of its proper divisors (732188415163).

3261566571557 is a wasteful number, since it uses less digits than its factorization.

3261566571557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3503293880 (or 3503293873 counting only the distinct ones).

The product of its digits is 39690000, while the sum is 59.

The spelling of 3261566571557 in words is "three trillion, two hundred sixty-one billion, five hundred sixty-six million, five hundred seventy-one thousand, five hundred fifty-seven".