18006563457 has 24 divisors (see below), whose sum is σ = 26432739840. Its totient is φ = 11810111040.

The previous prime is 18006563441. The next prime is 18006563461. The reversal of 18006563457 is 75436560081.

18006563457 is a `hidden beast` number, since 1 + 8 + 0 + 0 + 6 + 5 + 634 + 5 + 7 = 666.

It is not a de Polignac number, because 18006563457 - 2⁴ = 18006563441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18006563957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 154728 + ... + 244854.

It is an arithmetic number, because the mean of its divisors is an integer number (1101364160).

Almost surely, 2^18006563457 is an apocalyptic number.

It is an amenable number.

18006563457 is a deficient number, since it is larger than the sum of its proper divisors (8426176383).

18006563457 is a wasteful number, since it uses less digits than its factorization.

18006563457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90493 (or 90490 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 45.

The spelling of 18006563457 in words is "eighteen billion, six million, five hundred sixty-three thousand, four hundred fifty-seven".