19991278295 has 32 divisors (see below), whose sum is σ = 24928763904. Its totient is φ = 15374160000.

The previous prime is 19991278283. The next prime is 19991278313. The reversal of 19991278295 is 59287219991.

It is not a de Polignac number, because 19991278295 - 2²⁶ = 19924169431 is a prime.

It is a Duffinian number.

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 31 ways as a sum of consecutive naturals, for example, 26619170 + ... + 26619920.

It is an arithmetic number, because the mean of its divisors is an integer number (779023872).

Almost surely, 2^19991278295 is an apocalyptic number.

19991278295 is a deficient number, since it is larger than the sum of its proper divisors (4937485609).

19991278295 is a wasteful number, since it uses less digits than its factorization.

19991278295 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1703.

The product of its digits is 7348320, while the sum is 62.

The spelling of 19991278295 in words is "nineteen billion, nine hundred ninety-one million, two hundred seventy-eight thousand, two hundred ninety-five".