19865953329 has 16 divisors (see below), whose sum is σ = 27909430080. Its totient is φ = 12534592320.

The previous prime is 19865953319. The next prime is 19865953333. The reversal of 19865953329 is 92335956891.

It is not a de Polignac number, because 19865953329 - 2⁵ = 19865953297 is a prime.

It is a super-2 number, since 2×19865953329² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19865953319) 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, 112482 + ... + 228875.

It is an arithmetic number, because the mean of its divisors is an integer number (1744339380).

Almost surely, 2^19865953329 is an apocalyptic number.

19865953329 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

19865953329 is a deficient number, since it is larger than the sum of its proper divisors (8043476751).

19865953329 is a wasteful number, since it uses less digits than its factorization.

19865953329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342400.

The product of its digits is 15746400, while the sum is 60.

The spelling of 19865953329 in words is "nineteen billion, eight hundred sixty-five million, nine hundred fifty-three thousand, three hundred twenty-nine".