18786653145 has 24 divisors (see below), whose sum is σ = 35068420296. Its totient is φ = 9248813568.

The previous prime is 18786653129. The next prime is 18786653147. The reversal of 18786653145 is 54135668781.

It is a happy number.

18786653145 is a `hidden beast` number, since 1 + 8 + 7 + 8 + 66 + 531 + 45 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 12446784 + 18774206361 = 3528^2 + 137019^2 .

It is not a de Polignac number, because 18786653145 - 2⁴ = 18786653129 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18786653091 and 18786653100.

It is not an unprimeable number, because it can be changed into a prime (18786653147) 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, 16056384 + ... + 16057553.

It is an arithmetic number, because the mean of its divisors is an integer number (1461184179).

Almost surely, 2^18786653145 is an apocalyptic number.

18786653145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18786653145 is a deficient number, since it is larger than the sum of its proper divisors (16281767151).

18786653145 is a wasteful number, since it uses less digits than its factorization.

18786653145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32113961 (or 32113958 counting only the distinct ones).

The product of its digits is 4838400, while the sum is 54.

The spelling of 18786653145 in words is "eighteen billion, seven hundred eighty-six million, six hundred fifty-three thousand, one hundred forty-five".