6442816815 has 64 divisors (see below), whose sum is σ = 11822860800. Its totient is φ = 3327236352.

The previous prime is 6442816763. The next prime is 6442816907. The reversal of 6442816815 is 5186182446.

It is a happy number.

6442816815 is a `hidden beast` number, since 64 + 428 + 168 + 1 + 5 = 666.

It is not a de Polignac number, because 6442816815 - 2¹³ = 6442808623 is a prime.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 527619 + ... + 539691.

It is an arithmetic number, because the mean of its divisors is an integer number (184732200).

Almost surely, 2^6442816815 is an apocalyptic number.

6442816815 is a deficient number, since it is larger than the sum of its proper divisors (5380043985).

6442816815 is a wasteful number, since it uses less digits than its factorization.

6442816815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12213 (or 12207 counting only the distinct ones).

The product of its digits is 368640, while the sum is 45.

The square root of 6442816815 is about 80267.1590066573. The cubic root of 6442816815 is about 1860.7667104458.

The spelling of 6442816815 in words is "six billion, four hundred forty-two million, eight hundred sixteen thousand, eight hundred fifteen".