6681641515 has 8 divisors (see below), whose sum is σ = 8114572368. Its totient is φ = 5280911520.

The previous prime is 6681641489. The next prime is 6681641537. The reversal of 6681641515 is 5151461866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6681641515 - 2¹⁹ = 6681117227 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8049756 + ... + 8050585.

It is an arithmetic number, because the mean of its divisors is an integer number (1014321546).

Almost surely, 2^6681641515 is an apocalyptic number.

6681641515 is a deficient number, since it is larger than the sum of its proper divisors (1432930853).

6681641515 is a wasteful number, since it uses less digits than its factorization.

6681641515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16100429.

The product of its digits is 172800, while the sum is 43.

The square root of 6681641515 is about 81741.3084982128. The cubic root of 6681641515 is about 1883.4801911394.

The spelling of 6681641515 in words is "six billion, six hundred eighty-one million, six hundred forty-one thousand, five hundred fifteen".