2165612616 has 48 divisors (see below), whose sum is σ = 5899137660. Its totient is φ = 717694080.

The previous prime is 2165612597. The next prime is 2165612629. The reversal of 2165612616 is 6162165612.

2165612616 is a `hidden beast` number, since 21 + 6 + 5 + 6 + 12 + 616 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1832696100 + 332916516 = 42810^2 + 18246^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 74475 + ... + 99386.

Almost surely, 2^2165612616 is an apocalyptic number.

It is an amenable number.

2165612616 is an abundant number, since it is smaller than the sum of its proper divisors (3733525044).

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

2165612616 is a wasteful number, since it uses less digits than its factorization.

2165612616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174046 (or 174039 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 2165612616 is about 46536.1431147877. The cubic root of 2165612616 is about 1293.7794766371.

The spelling of 2165612616 in words is "two billion, one hundred sixty-five million, six hundred twelve thousand, six hundred sixteen".