18439680623 has 16 divisors (see below), whose sum is σ = 22715434560. Its totient is φ = 14576495616.

The previous prime is 18439680569. The next prime is 18439680629. The reversal of 18439680623 is 32608693481.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 18439680623 - 2¹⁸ = 18439418479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18439680629) 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, 10943 + ... + 192351.

It is an arithmetic number, because the mean of its divisors is an integer number (1419714660).

Almost surely, 2^18439680623 is an apocalyptic number.

18439680623 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

18439680623 is a deficient number, since it is larger than the sum of its proper divisors (4275753937).

18439680623 is a wasteful number, since it uses less digits than its factorization.

18439680623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182546.

The product of its (nonzero) digits is 1492992, while the sum is 50.

The spelling of 18439680623 in words is "eighteen billion, four hundred thirty-nine million, six hundred eighty thousand, six hundred twenty-three".