1661600616 has 64 divisors (see below), whose sum is σ = 4709006400. Its totient is φ = 484351488.

The previous prime is 1661600609. The next prime is 1661600627. The reversal of 1661600616 is 6160061661.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 134221 + ... + 146076.

It is an arithmetic number, because the mean of its divisors is an integer number (73578225).

Almost surely, 2^1661600616 is an apocalyptic number.

It is an amenable number.

1661600616 is an abundant number, since it is smaller than the sum of its proper divisors (3047405784).

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

1661600616 is a wasteful number, since it uses less digits than its factorization.

1661600616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280338 (or 280334 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 1661600616 is about 40762.7356294938. The cubic root of 1661600616 is about 1184.4285888280.

The spelling of 1661600616 in words is "one billion, six hundred sixty-one million, six hundred thousand, six hundred sixteen".