18435916925 has 12 divisors (see below), whose sum is σ = 23478390516. Its totient is φ = 14350118400.

The previous prime is 18435916921. The next prime is 18435916943. The reversal of 18435916925 is 52961953481.

It can be written as a sum of positive squares in 6 ways, for example, as 1033558201 + 17402358724 = 32149^2 + 131918^2 .

It is not a de Polignac number, because 18435916925 - 2² = 18435916921 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18435916921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9964436 + ... + 9966285.

It is an arithmetic number, because the mean of its divisors is an integer number (1956532543).

Almost surely, 2^18435916925 is an apocalyptic number.

It is an amenable number.

18435916925 is a deficient number, since it is larger than the sum of its proper divisors (5042473591).

18435916925 is a wasteful number, since it uses less digits than its factorization.

18435916925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19930768 (or 19930763 counting only the distinct ones).

The product of its digits is 2332800, while the sum is 53.

The spelling of 18435916925 in words is "eighteen billion, four hundred thirty-five million, nine hundred sixteen thousand, nine hundred twenty-five".