6412819815 has 80 divisors (see below), whose sum is σ = 12225061728. Its totient is φ = 3218144256.

The previous prime is 6412819753. The next prime is 6412819817. The reversal of 6412819815 is 5189182146.

It is a happy number.

It is not a de Polignac number, because 6412819815 - 2¹⁷ = 6412688743 is a prime.

It is a super-2 number, since 2×6412819815² = 82248515959313268450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6412819817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1671139 + ... + 1674971.

Almost surely, 2^6412819815 is an apocalyptic number.

6412819815 is a deficient number, since it is larger than the sum of its proper divisors (5812241913).

6412819815 is an frugal number, since it uses more digits than its factorization.

6412819815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3882 (or 3858 counting only the distinct ones).

The product of its digits is 138240, while the sum is 45.

The square root of 6412819815 is about 80080.0837599462. The cubic root of 6412819815 is about 1857.8743797651.

The spelling of 6412819815 in words is "six billion, four hundred twelve million, eight hundred nineteen thousand, eight hundred fifteen".