18639326629 has 48 divisors (see below), whose sum is σ = 25757524800. Its totient is φ = 13285036800.

The previous prime is 18639326627. The next prime is 18639326647. The reversal of 18639326629 is 92662393681.

It is not a de Polignac number, because 18639326629 - 2¹ = 18639326627 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18639326629.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18639326627) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 265609 + ... + 328369.

It is an arithmetic number, because the mean of its divisors is an integer number (536615100).

Almost surely, 2^18639326629 is an apocalyptic number.

18639326629 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

18639326629 is a deficient number, since it is larger than the sum of its proper divisors (7118198171).

18639326629 is a wasteful number, since it uses less digits than its factorization.

18639326629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62834 (or 62827 counting only the distinct ones).

The product of its digits is 5038848, while the sum is 55.

The spelling of 18639326629 in words is "eighteen billion, six hundred thirty-nine million, three hundred twenty-six thousand, six hundred twenty-nine".