6615615555 has 24 divisors (see below), whose sum is σ = 11683430928. Its totient is φ = 3461754816.

The previous prime is 6615615553. The next prime is 6615615563. The reversal of 6615615555 is 5555165166.

It is not a de Polignac number, because 6615615555 - 2¹ = 6615615553 is a prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 6615615555.

It is not an unprimeable number, because it can be changed into a prime (6615615553) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1384537 + ... + 1389306.

It is an arithmetic number, because the mean of its divisors is an integer number (486809622).

Almost surely, 2^6615615555 is an apocalyptic number.

6615615555 is a deficient number, since it is larger than the sum of its proper divisors (5067815373).

6615615555 is a wasteful number, since it uses less digits than its factorization.

6615615555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2773907 (or 2773904 counting only the distinct ones).

The product of its digits is 675000, while the sum is 45.

The square root of 6615615555 is about 81336.4343636971. The cubic root of 6615615555 is about 1877.2556490704.

It can be divided in two parts, 6615 and 615555, that added together give a triangular number (622170 = T₁₁₁₅).

The spelling of 6615615555 in words is "six billion, six hundred fifteen million, six hundred fifteen thousand, five hundred fifty-five".