3815817420865 has 32 divisors (see below), whose sum is σ = 5029801862400. Its totient is φ = 2766107646720.

The previous prime is 3815817420859. The next prime is 3815817420869. The reversal of 3815817420865 is 5680247185183.

It is not a de Polignac number, because 3815817420865 - 2¹⁷ = 3815817289793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3815817420869) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 62873635 + ... + 62934295.

It is an arithmetic number, because the mean of its divisors is an integer number (157181308200).

Almost surely, 2^{3815817420865} is an apocalyptic number.

It is an amenable number.

3815817420865 is a deficient number, since it is larger than the sum of its proper divisors (1213984441535).

3815817420865 is a wasteful number, since it uses less digits than its factorization.

3815817420865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89497.

The product of its (nonzero) digits is 12902400, while the sum is 58.

The spelling of 3815817420865 in words is "three trillion, eight hundred fifteen billion, eight hundred seventeen million, four hundred twenty thousand, eight hundred sixty-five".