6615611556 has 48 divisors (see below), whose sum is σ = 15594828480. Its totient is φ = 2182619520.

The previous prime is 6615611551. The next prime is 6615611579. The reversal of 6615611556 is 6551165166.

It is a super-2 number, since 2×6615611556² = 87532632519761482272, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6615611551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1550466 + ... + 1554726.

It is an arithmetic number, because the mean of its divisors is an integer number (324892260).

Almost surely, 2^6615611556 is an apocalyptic number.

It is an amenable number.

6615611556 is an abundant number, since it is smaller than the sum of its proper divisors (8979216924).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6615611556 is a wasteful number, since it uses less digits than its factorization.

6615611556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5564 (or 5562 counting only the distinct ones).

The product of its digits is 162000, while the sum is 42.

The square root of 6615611556 is about 81336.4097806142. The cubic root of 6615611556 is about 1877.2552708165.

The spelling of 6615611556 in words is "six billion, six hundred fifteen million, six hundred eleven thousand, five hundred fifty-six".