6690815499 has 4 divisors (see below), whose sum is σ = 8921087336. Its totient is φ = 4460543664.

The previous prime is 6690815497. The next prime is 6690815507. The reversal of 6690815499 is 9945180966.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 6690815499 - 2¹ = 6690815497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6690815497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1115135914 + ... + 1115135919.

It is an arithmetic number, because the mean of its divisors is an integer number (2230271834).

Almost surely, 2^6690815499 is an apocalyptic number.

6690815499 is a deficient number, since it is larger than the sum of its proper divisors (2230271837).

6690815499 is a wasteful number, since it uses less digits than its factorization.

6690815499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2230271836.

The product of its (nonzero) digits is 4199040, while the sum is 57.

The square root of 6690815499 is about 81797.4052094564. The cubic root of 6690815499 is about 1884.3418114971.

The spelling of 6690815499 in words is "six billion, six hundred ninety million, eight hundred fifteen thousand, four hundred ninety-nine".