18511233945 has 32 divisors (see below), whose sum is σ = 30540488832. Its totient is φ = 9569644032.

The previous prime is 18511233941. The next prime is 18511233967. The reversal of 18511233945 is 54933211581.

It is a happy number.

It is not a de Polignac number, because 18511233945 - 2² = 18511233941 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18511233897 and 18511233906.

It is not an unprimeable number, because it can be changed into a prime (18511233941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 74284 + ... + 206253.

It is an arithmetic number, because the mean of its divisors is an integer number (954390276).

Almost surely, 2^18511233945 is an apocalyptic number.

18511233945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18511233945 is a deficient number, since it is larger than the sum of its proper divisors (12029254887).

18511233945 is a wasteful number, since it uses less digits than its factorization.

18511233945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280681.

The product of its digits is 129600, while the sum is 42.

The spelling of 18511233945 in words is "eighteen billion, five hundred eleven million, two hundred thirty-three thousand, nine hundred forty-five".