6616661508 has 72 divisors (see below), whose sum is σ = 17182488960. Its totient is φ = 2145594240.

The previous prime is 6616661503. The next prime is 6616661509. The reversal of 6616661508 is 8051666166.

It is a super-2 number, since 2×6616661508² = 87560419022897668128, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6616661501) 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 23 ways as a sum of consecutive naturals, for example, 523641 + ... + 536127.

It is an arithmetic number, because the mean of its divisors is an integer number (238645680).

Almost surely, 2^6616661508 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6616661508, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8591244480).

6616661508 is an abundant number, since it is smaller than the sum of its proper divisors (10565827452).

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

6616661508 is a wasteful number, since it uses less digits than its factorization.

6616661508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12897 (or 12892 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The square root of 6616661508 is about 81342.8639033566. The cubic root of 6616661508 is about 1877.3545775168.

The spelling of 6616661508 in words is "six billion, six hundred sixteen million, six hundred sixty-one thousand, five hundred eight".