18643629459 has 16 divisors (see below), whose sum is σ = 30594674432. Its totient is φ = 9834002208.

The previous prime is 18643629457. The next prime is 18643629481. The reversal of 18643629459 is 95492634681.

It is not a de Polignac number, because 18643629459 - 2¹ = 18643629457 is a prime.

It is a super-3 number, since 3×18643629459³ (a number of 32 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 18643629399 and 18643629408.

It is not an unprimeable number, because it can be changed into a prime (18643629457) 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, 34145569 + ... + 34146114.

It is an arithmetic number, because the mean of its divisors is an integer number (1912167152).

Almost surely, 2^18643629459 is an apocalyptic number.

18643629459 is a deficient number, since it is larger than the sum of its proper divisors (11951044973).

18643629459 is a wasteful number, since it uses less digits than its factorization.

18643629459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68291706.

The product of its digits is 11197440, while the sum is 57.

The spelling of 18643629459 in words is "eighteen billion, six hundred forty-three million, six hundred twenty-nine thousand, four hundred fifty-nine".