18523449329 has 16 divisors (see below), whose sum is σ = 23140131840. Its totient is φ = 14405130960.

The previous prime is 18523449323. The next prime is 18523449341. The reversal of 18523449329 is 92394432581.

It is a happy number.

It is not a de Polignac number, because 18523449329 - 2¹² = 18523445233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18523449323) 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, 200399 + ... + 277860.

It is an arithmetic number, because the mean of its divisors is an integer number (1446258240).

Almost surely, 2^18523449329 is an apocalyptic number.

It is an amenable number.

18523449329 is a deficient number, since it is larger than the sum of its proper divisors (4616682511).

18523449329 is a wasteful number, since it uses less digits than its factorization.

18523449329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478780.

The product of its digits is 1866240, while the sum is 50.

The spelling of 18523449329 in words is "eighteen billion, five hundred twenty-three million, four hundred forty-nine thousand, three hundred twenty-nine".