19891206495 has 144 divisors (see below), whose sum is σ = 38343352320. Its totient is φ = 9519244416.

The previous prime is 19891206479. The next prime is 19891206509. The reversal of 19891206495 is 59460219891.

It is not a de Polignac number, because 19891206495 - 2⁴ = 19891206479 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 51935074 + ... + 51935456.

It is an arithmetic number, because the mean of its divisors is an integer number (266273280).

Almost surely, 2^19891206495 is an apocalyptic number.

19891206495 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

19891206495 is a deficient number, since it is larger than the sum of its proper divisors (18452145825).

19891206495 is a wasteful number, since it uses less digits than its factorization.

19891206495 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 594 (or 572 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 54.

The spelling of 19891206495 in words is "nineteen billion, eight hundred ninety-one million, two hundred six thousand, four hundred ninety-five".