18695366361 has 81 divisors (see below), whose sum is σ = 33457195551. Its totient is φ = 10028398464.

The previous prime is 18695366329. The next prime is 18695366387. The reversal of 18695366361 is 16366359681.

The square root of 18695366361 is 136731.

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

18695366361 is a `hidden beast` number, since 18 + 69 + 536 + 6 + 36 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 14555216025 + 4140150336 = 120645^2 + 64344^2 .

It is not a de Polignac number, because 18695366361 - 2⁵ = 18695366329 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18695366298 and 18695366307.

It is not an unprimeable number, because it can be changed into a prime (18695368361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 48812776 + ... + 48813158.

Almost surely, 2^18695366361 is an apocalyptic number.

18695366361 is the 136731-st square number.

18695366361 is the 68366-th centered octagonal number.

It is an amenable number.

18695366361 is a deficient number, since it is larger than the sum of its proper divisors (14761829190).

18695366361 is an equidigital number, since it uses as much as digits as its factorization.

18695366361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 820 (or 410 counting only the distinct ones).

The product of its digits is 4199040, while the sum is 54.

The spelling of 18695366361 in words is "eighteen billion, six hundred ninety-five million, three hundred sixty-six thousand, three hundred sixty-one".