6555555515 has 4 divisors (see below), whose sum is σ = 7866666624. Its totient is φ = 5244444408.

The previous prime is 6555555509. The next prime is 6555555547. The reversal of 6555555515 is 5155555556.

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

It is a cyclic number.

It is not a de Polignac number, because 6555555515 - 2²² = 6551361211 is a prime.

It is a super-2 number, since 2×6555555515² = 85950616220493830450, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6555555515.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 655555547 + ... + 655555556.

It is an arithmetic number, because the mean of its divisors is an integer number (1966666656).

Almost surely, 2^6555555515 is an apocalyptic number.

6555555515 is a deficient number, since it is larger than the sum of its proper divisors (1311111109).

6555555515 is a wasteful number, since it uses less digits than its factorization.

6555555515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1311111108.

The product of its digits is 2343750, while the sum is 47.

The square root of 6555555515 is about 80966.3850928273. The cubic root of 6555555515 is about 1871.5574654744.

It can be divided in two parts, 655555551 and 5, that added together give a palindrome (655555556).

The spelling of 6555555515 in words is "six billion, five hundred fifty-five million, five hundred fifty-five thousand, five hundred fifteen".