3865161556 has 12 divisors (see below), whose sum is σ = 6765886260. Its totient is φ = 1932051200.

The previous prime is 3865161551. The next prime is 3865161563. The reversal of 3865161556 is 6551615683.

It can be written as a sum of positive squares in 2 ways, for example, as 2811120400 + 1054041156 = 53020^2 + 32466^2 .

It is a super-2 number, since 2×3865161556² = 29878947707960682272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3865161551) 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 in 3 ways as a sum of consecutive naturals, for example, 115741 + ... + 145348.

It is an arithmetic number, because the mean of its divisors is an integer number (563823855).

Almost surely, 2^3865161556 is an apocalyptic number.

It is an amenable number.

3865161556 is a deficient number, since it is larger than the sum of its proper divisors (2900724704).

3865161556 is a wasteful number, since it uses less digits than its factorization.

3865161556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264794 (or 264792 counting only the distinct ones).

The product of its digits is 648000, while the sum is 46.

The square root of 3865161556 is about 62170.4234825532. The cubic root of 3865161556 is about 1569.3598964694.

The spelling of 3865161556 in words is "three billion, eight hundred sixty-five million, one hundred sixty-one thousand, five hundred fifty-six".