19665167025 has 48 divisors (see below), whose sum is σ = 37170192384. Its totient is φ = 8986793280.

The previous prime is 19665167021. The next prime is 19665167033. The reversal of 19665167025 is 52076156691.

It is not a de Polignac number, because 19665167025 - 2² = 19665167021 is a prime.

It is a super-2 number, since 2×19665167025² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19665167021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2622832 + ... + 2630318.

It is an arithmetic number, because the mean of its divisors is an integer number (774379008).

Almost surely, 2^19665167025 is an apocalyptic number.

19665167025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19665167025 is a deficient number, since it is larger than the sum of its proper divisors (17505025359).

19665167025 is a wasteful number, since it uses less digits than its factorization.

19665167025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12510 (or 12505 counting only the distinct ones).

The product of its (nonzero) digits is 680400, while the sum is 48.

The spelling of 19665167025 in words is "nineteen billion, six hundred sixty-five million, one hundred sixty-seven thousand, twenty-five".