2150865716661 has 24 divisors (see below), whose sum is σ = 3154161716160. Its totient is φ = 1412067387456.

The previous prime is 2150865716653. The next prime is 2150865716683. The reversal of 2150865716661 is 1666175680512.

It is not a de Polignac number, because 2150865716661 - 2³ = 2150865716653 is a prime.

It is a super-2 number, since 2×2150865716661² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2150865716598 and 2150865716607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2150865716621) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1379256 + ... + 2490798.

It is an arithmetic number, because the mean of its divisors is an integer number (131423404840).

Almost surely, 2^{2150865716661} is an apocalyptic number.

It is an amenable number.

2150865716661 is a deficient number, since it is larger than the sum of its proper divisors (1003295999499).

2150865716661 is a wasteful number, since it uses less digits than its factorization.

2150865716661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1114825 (or 1114822 counting only the distinct ones).

The product of its (nonzero) digits is 3628800, while the sum is 54.

The spelling of 2150865716661 in words is "two trillion, one hundred fifty billion, eight hundred sixty-five million, seven hundred sixteen thousand, six hundred sixty-one".