18534647647 has 16 divisors (see below), whose sum is σ = 19893565440. Its totient is φ = 17206031232.

The previous prime is 18534647617. The next prime is 18534647693. The reversal of 18534647647 is 74674643581.

It is a cyclic number.

It is not a de Polignac number, because 18534647647 - 2⁷ = 18534647519 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18534647617) 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, 1421118 + ... + 1434100.

It is an arithmetic number, because the mean of its divisors is an integer number (1243347840).

Almost surely, 2^18534647647 is an apocalyptic number.

18534647647 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

18534647647 is a deficient number, since it is larger than the sum of its proper divisors (1358917793).

18534647647 is a wasteful number, since it uses less digits than its factorization.

18534647647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14142.

The product of its digits is 13547520, while the sum is 55.

The spelling of 18534647647 in words is "eighteen billion, five hundred thirty-four million, six hundred forty-seven thousand, six hundred forty-seven".