2081660297616 has 45 divisors (see below), whose sum is σ = 5825806092769. Its totient is φ = 693880994688.

The previous prime is 2081660297609. The next prime is 2081660297623. The reversal of 2081660297616 is 6167920661802.

The square root of 2081660297616 is 1442796.

It is a perfect power (a square), and thus also a powerful number.

2081660297616 is a `hidden beast` number, since 2 + 0 + 8 + 16 + 6 + 0 + 2 + 9 + 7 + 616 = 666.

It is an interprime number because it is at equal distance from previous prime (2081660297609) and next prime (2081660297623).

It can be written as a sum of positive squares in only one way, i.e., 364260531600 + 1717399766016 = 603540^2 + 1310496^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 17253436 + ... + 17373668.

Almost surely, 2^{2081660297616} is an apocalyptic number.

2081660297616 is the 1442796-th square number.

It is an amenable number.

2081660297616 is an abundant number, since it is smaller than the sum of its proper divisors (3744145795153).

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

2081660297616 is an frugal number, since it uses more digits than its factorization.

2081660297616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240480 (or 120238 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 54.

The spelling of 2081660297616 in words is "two trillion, eighty-one billion, six hundred sixty million, two hundred ninety-seven thousand, six hundred sixteen".