3865544525505 has 128 divisors (see below), whose sum is σ = 6866479226880. Its totient is φ = 1844629079040.

The previous prime is 3865544525503. The next prime is 3865544525533. The reversal of 3865544525505 is 5055254455683.

It is not a de Polignac number, because 3865544525505 - 2¹ = 3865544525503 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3865544525503) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 3543120010 + ... + 3543121100.

It is an arithmetic number, because the mean of its divisors is an integer number (53644368960).

Almost surely, 2^{3865544525505} is an apocalyptic number.

It is an amenable number.

3865544525505 is a deficient number, since it is larger than the sum of its proper divisors (3000934701375).

3865544525505 is a wasteful number, since it uses less digits than its factorization.

3865544525505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2551.

The product of its (nonzero) digits is 72000000, while the sum is 57.

The spelling of 3865544525505 in words is "three trillion, eight hundred sixty-five billion, five hundred forty-four million, five hundred twenty-five thousand, five hundred five".