6616661616 has 60 divisors (see below), whose sum is σ = 18866870568. Its totient is φ = 2163937152.

The previous prime is 6616661591. The next prime is 6616661629. The reversal of 6616661616 is 6161666166.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 425850 + ... + 441113.

Almost surely, 2^6616661616 is an apocalyptic number.

It is an amenable number.

6616661616 is an abundant number, since it is smaller than the sum of its proper divisors (12250208952).

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

6616661616 is a wasteful number, since it uses less digits than its factorization.

6616661616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 867030 (or 867021 counting only the distinct ones).

The product of its digits is 279936, while the sum is 45.

The square root of 6616661616 is about 81342.8645672133. The cubic root of 6616661616 is about 1877.3545877311.

The spelling of 6616661616 in words is "six billion, six hundred sixteen million, six hundred sixty-one thousand, six hundred sixteen".