16864788361 has 16 divisors (see below), whose sum is σ = 17585075200. Its totient is φ = 16155806400.

The previous prime is 16864788359. The next prime is 16864788371. The reversal of 16864788361 is 16388746861.

It is a happy number.

It is a 12-Lehmer number, since φ(16864788361) divides (16864788361-1)¹².

It is a cyclic number.

It is not a de Polignac number, because 16864788361 - 2¹ = 16864788359 is a prime.

It is a super-2 number, since 2×16864788361² (a number of 21 digits) contains 22 as substring.

It is the 129865-th Hogben number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16864788296 and 16864788305.

It is not an unprimeable number, because it can be changed into a prime (16864788331) by changing a digit.

It is a nontrivial repunit in base 129864.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5475820 + ... + 5478898.

It is an arithmetic number, because the mean of its divisors is an integer number (1099067200).

Almost surely, 2^16864788361 is an apocalyptic number.

It is an amenable number.

16864788361 is a deficient number, since it is larger than the sum of its proper divisors (720286839).

16864788361 is a wasteful number, since it uses less digits than its factorization.

16864788361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4840.

The product of its digits is 9289728, while the sum is 58.

The spelling of 16864788361 in words is "sixteen billion, eight hundred sixty-four million, seven hundred eighty-eight thousand, three hundred sixty-one".