1661610616 has 16 divisors (see below), whose sum is σ = 3120578640. Its totient is φ = 829456320.

The previous prime is 1661610611. The next prime is 1661610631. The reversal of 1661610616 is 6160161661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661610611) 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 3 ways as a sum of consecutive naturals, for example, 163380 + ... + 173251.

It is an arithmetic number, because the mean of its divisors is an integer number (195036165).

Almost surely, 2^1661610616 is an apocalyptic number.

It is an amenable number.

1661610616 is a deficient number, since it is larger than the sum of its proper divisors (1458968024).

1661610616 is a wasteful number, since it uses less digits than its factorization.

1661610616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337254 (or 337250 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 1661610616 is about 40762.8582903604. The cubic root of 1661610616 is about 1184.4309649028.

The spelling of 1661610616 in words is "one billion, six hundred sixty-one million, six hundred ten thousand, six hundred sixteen".