6615561066 has 8 divisors (see below), whose sum is σ = 13231122144. Its totient is φ = 2205187020.

The previous prime is 6615561059. The next prime is 6615561149. The reversal of 6615561066 is 6601655166.

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

6615561066 is an admirable number.

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, 551296750 + ... + 551296761.

It is an arithmetic number, because the mean of its divisors is an integer number (1653890268).

Almost surely, 2^6615561066 is an apocalyptic number.

6615561066 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

6615561066 is a wasteful number, since it uses less digits than its factorization.

6615561066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1102593516.

The product of its (nonzero) digits is 194400, while the sum is 42.

The square root of 6615561066 is about 81336.0994024179. The cubic root of 6615561066 is about 1877.2504950998.

The spelling of 6615561066 in words is "six billion, six hundred fifteen million, five hundred sixty-one thousand, sixty-six".