16166021517 has 12 divisors (see below), whose sum is σ = 23399675520. Its totient is φ = 10754845128.

The previous prime is 16166021513. The next prime is 16166021549. The reversal of 16166021517 is 71512066161.

It is a happy number.

16166021517 is a `hidden beast` number, since 1 + 61 + 6 + 60 + 21 + 517 = 666.

It is not a de Polignac number, because 16166021517 - 2² = 16166021513 is a prime.

It is a super-2 number, since 2×16166021517² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16166021513) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1870663 + ... + 1879284.

It is an arithmetic number, because the mean of its divisors is an integer number (1949972960).

Almost surely, 2^16166021517 is an apocalyptic number.

It is an amenable number.

16166021517 is a deficient number, since it is larger than the sum of its proper divisors (7233654003).

16166021517 is a wasteful number, since it uses less digits than its factorization.

16166021517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3750432 (or 3750429 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

Adding to 16166021517 its reverse (71512066161), we get a palindrome (87678087678).

The spelling of 16166021517 in words is "sixteen billion, one hundred sixty-six million, twenty-one thousand, five hundred seventeen".