1661848616 has 8 divisors (see below), whose sum is σ = 3115966170. Its totient is φ = 830924304.

The previous prime is 1661848603. The next prime is 1661848619. The reversal of 1661848616 is 6168481661.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1462756516 + 199092100 = 38246^2 + 14110^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×1661848616² = 5523481645002230912, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1661848619) 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 as a sum of consecutive naturals, namely, 103865531 + ... + 103865546.

Almost surely, 2^1661848616 is an apocalyptic number.

It is an amenable number.

1661848616 is a deficient number, since it is larger than the sum of its proper divisors (1454117554).

1661848616 is a wasteful number, since it uses less digits than its factorization.

1661848616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207731083 (or 207731079 counting only the distinct ones).

The product of its digits is 331776, while the sum is 47.

The square root of 1661848616 is about 40765.7775100635. Note that the first 3 decimals coincide. The cubic root of 1661848616 is about 1184.4875126702.

The spelling of 1661848616 in words is "one billion, six hundred sixty-one million, eight hundred forty-eight thousand, six hundred sixteen".