3866609252605 has 16 divisors (see below), whose sum is σ = 5064361755264. Its totient is φ = 2810624604480.

The previous prime is 3866609252593. The next prime is 3866609252609. The reversal of 3866609252605 is 5062529066683.

It is a happy number.

It is not a de Polignac number, because 3866609252605 - 2¹⁷ = 3866609121533 is a prime.

It is a super-2 number, since 2×3866609252605² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3866609252605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3866609252609) 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, 18078369 + ... + 18290998.

It is an arithmetic number, because the mean of its divisors is an integer number (316522609704).

Almost surely, 2^{3866609252605} is an apocalyptic number.

It is an amenable number.

3866609252605 is a deficient number, since it is larger than the sum of its proper divisors (1197752502659).

3866609252605 is a wasteful number, since it uses less digits than its factorization.

3866609252605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36371316.

The product of its (nonzero) digits is 27993600, while the sum is 58.

The spelling of 3866609252605 in words is "three trillion, eight hundred sixty-six billion, six hundred nine million, two hundred fifty-two thousand, six hundred five".