18540734463 has 16 divisors (see below), whose sum is σ = 29083505760. Its totient is φ = 11633401728.

The previous prime is 18540734419. The next prime is 18540734473. The reversal of 18540734463 is 36443704581.

18540734463 is a `hidden beast` number, since 1 + 8 + 540 + 7 + 3 + 44 + 63 = 666.

It is not a de Polignac number, because 18540734463 - 2¹² = 18540730367 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18540734473) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20196420 + ... + 20197337.

It is an arithmetic number, because the mean of its divisors is an integer number (1817719110).

Almost surely, 2^18540734463 is an apocalyptic number.

18540734463 is a deficient number, since it is larger than the sum of its proper divisors (10542771297).

18540734463 is a wasteful number, since it uses less digits than its factorization.

18540734463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40393783 (or 40393777 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 45.

The spelling of 18540734463 in words is "eighteen billion, five hundred forty million, seven hundred thirty-four thousand, four hundred sixty-three".