18656488463 has 4 divisors (see below), whose sum is σ = 18709945800. Its totient is φ = 18603031128.

The previous prime is 18656488447. The next prime is 18656488469. The reversal of 18656488463 is 36488465681.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36488465681 = 233 ⋅156602857.

It is a cyclic number.

It is not a de Polignac number, because 18656488463 - 2⁴ = 18656488447 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 (18656488469) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26728145 + ... + 26728842.

It is an arithmetic number, because the mean of its divisors is an integer number (4677486450).

Almost surely, 2^18656488463 is an apocalyptic number.

18656488463 is a deficient number, since it is larger than the sum of its proper divisors (53457337).

18656488463 is an equidigital number, since it uses as much as digits as its factorization.

18656488463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53457336.

The product of its digits is 26542080, while the sum is 59.

The spelling of 18656488463 in words is "eighteen billion, six hundred fifty-six million, four hundred eighty-eight thousand, four hundred sixty-three".