6405878873515 has 12 divisors (see below), whose sum is σ = 8449407176112. Its totient is φ = 4658820998480.

The previous prime is 6405878873501. The next prime is 6405878873531. The reversal of 6405878873515 is 5153788785046.

It is not a de Polignac number, because 6405878873515 - 2³⁵ = 6371519135147 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5294114167 + ... + 5294115376.

It is an arithmetic number, because the mean of its divisors is an integer number (704117264676).

Almost surely, 2^{6405878873515} is an apocalyptic number.

6405878873515 is a deficient number, since it is larger than the sum of its proper divisors (2043528302597).

6405878873515 is a wasteful number, since it uses less digits than its factorization.

6405878873515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10588229570 (or 10588229559 counting only the distinct ones).

The product of its (nonzero) digits is 225792000, while the sum is 67.

The spelling of 6405878873515 in words is "six trillion, four hundred five billion, eight hundred seventy-eight million, eight hundred seventy-three thousand, five hundred fifteen".