6615516515 has 16 divisors (see below), whose sum is σ = 7996418976. Its totient is φ = 5253984000.

The previous prime is 6615516469. The next prime is 6615516517. The reversal of 6615516515 is 5156155166.

It is not a de Polignac number, because 6615516515 - 2⁶ = 6615516451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6615516517) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 537824 + ... + 549986.

It is an arithmetic number, because the mean of its divisors is an integer number (499776186).

Almost surely, 2^6615516515 is an apocalyptic number.

6615516515 is a deficient number, since it is larger than the sum of its proper divisors (1380902461).

6615516515 is a wasteful number, since it uses less digits than its factorization.

6615516515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12950.

The product of its digits is 135000, while the sum is 41.

The square root of 6615516515 is about 81335.8255321725. The cubic root of 6615516515 is about 1877.2462811174.

The spelling of 6615516515 in words is "six billion, six hundred fifteen million, five hundred sixteen thousand, five hundred fifteen".