18587645063 has 32 divisors (see below), whose sum is σ = 21144001536. Its totient is φ = 16211467008.

The previous prime is 18587645059. The next prime is 18587645107. The reversal of 18587645063 is 36054678581.

It is a cyclic number.

It is not a de Polignac number, because 18587645063 - 2² = 18587645059 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18587644996 and 18587645014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18587641063) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15579995 + ... + 15581187.

It is an arithmetic number, because the mean of its divisors is an integer number (660750048).

Almost surely, 2^18587645063 is an apocalyptic number.

18587645063 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

18587645063 is a deficient number, since it is larger than the sum of its proper divisors (2556356473).

18587645063 is a wasteful number, since it uses less digits than its factorization.

18587645063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1823.

The product of its (nonzero) digits is 4838400, while the sum is 53.

The spelling of 18587645063 in words is "eighteen billion, five hundred eighty-seven million, six hundred forty-five thousand, sixty-three".