3865721385475 has 12 divisors (see below), whose sum is σ = 4806010181376. Its totient is φ = 3084502486880.

The previous prime is 3865721385313. The next prime is 3865721385479. The reversal of 3865721385475 is 5745831275683.

It is a happy number.

It is not a de Polignac number, because 3865721385475 - 2¹⁷ = 3865721254403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3865721385479) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 201855772 + ... + 201874921.

It is an arithmetic number, because the mean of its divisors is an integer number (400500848448).

Almost surely, 2^{3865721385475} is an apocalyptic number.

3865721385475 is a deficient number, since it is larger than the sum of its proper divisors (940288795901).

3865721385475 is a wasteful number, since it uses less digits than its factorization.

3865721385475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403731086 (or 403731081 counting only the distinct ones).

The product of its digits is 169344000, while the sum is 64.

The spelling of 3865721385475 in words is "three trillion, eight hundred sixty-five billion, seven hundred twenty-one million, three hundred eighty-five thousand, four hundred seventy-five".