18616692249 has 9 divisors (see below), whose sum is σ = 26891368959. Its totient is φ = 12410855280.

The previous prime is 18616692239. The next prime is 18616692301. The reversal of 18616692249 is 94229661681.

The square root of 18616692249 is 136443.

It is a perfect power (a square), and thus also a powerful number.

18616692249 is a `hidden beast` number, since 18 + 616 + 6 + 9 + 2 + 2 + 4 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 294362649 + 18322329600 = 17157^2 + 135360^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 18616692249 - 2⁷ = 18616692121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18616692195 and 18616692204.

It is not an unprimeable number, because it can be changed into a prime (18616692239) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 386589 + ... + 432069.

Almost surely, 2^18616692249 is an apocalyptic number.

18616692249 is the 136443-rd square number.

18616692249 is the 68222-nd centered octagonal number.

It is an amenable number.

18616692249 is a deficient number, since it is larger than the sum of its proper divisors (8274676710).

18616692249 is an frugal number, since it uses more digits than its factorization.

18616692249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90968 (or 45484 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 54.

The spelling of 18616692249 in words is "eighteen billion, six hundred sixteen million, six hundred ninety-two thousand, two hundred forty-nine".