19440509925 has 12 divisors (see below), whose sum is σ = 32141643200. Its totient is φ = 10368271920.

The previous prime is 19440509917. The next prime is 19440509941. The reversal of 19440509925 is 52990504491.

It is not a de Polignac number, because 19440509925 - 2³ = 19440509917 is a prime.

It is a super-2 number, since 2×19440509925² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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, 129603325 + ... + 129603474.

Almost surely, 2^19440509925 is an apocalyptic number.

19440509925 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19440509925 is a deficient number, since it is larger than the sum of its proper divisors (12701133275).

19440509925 is a wasteful number, since it uses less digits than its factorization.

19440509925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259206812 (or 259206807 counting only the distinct ones).

The product of its (nonzero) digits is 583200, while the sum is 48.

The spelling of 19440509925 in words is "nineteen billion, four hundred forty million, five hundred nine thousand, nine hundred twenty-five".