2116513665 has 64 divisors (see below), whose sum is σ = 4309009920. Its totient is φ = 965571840.

The previous prime is 2116513649. The next prime is 2116513669. The reversal of 2116513665 is 5663156112.

It is not a de Polignac number, because 2116513665 - 2⁴ = 2116513649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2116513669) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 524355 + ... + 528375.

It is an arithmetic number, because the mean of its divisors is an integer number (67328280).

Almost surely, 2^2116513665 is an apocalyptic number.

It is an amenable number.

2116513665 is an abundant number, since it is smaller than the sum of its proper divisors (2192496255).

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

2116513665 is a wasteful number, since it uses less digits than its factorization.

2116513665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4599 (or 4593 counting only the distinct ones).

The product of its digits is 32400, while the sum is 36.

The square root of 2116513665 is about 46005.5829764171. The cubic root of 2116513665 is about 1283.9270801020.

Adding to 2116513665 its reverse (5663156112), we get a palindrome (7779669777).

The spelling of 2116513665 in words is "two billion, one hundred sixteen million, five hundred thirteen thousand, six hundred sixty-five".