19749135999999 has 16 divisors (see below), whose sum is σ = 30094070503680. Its totient is φ = 11285164704000.

The previous prime is 19749135999961. The next prime is 19749136000019. The reversal of 19749135999999 is 99999953194791.

It is a Cunningham number, because it is equal to 4444000²-1.

It is not a de Polignac number, because 19749135999999 - 2⁸ = 19749135999743 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19749135999949) 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, 2221999 + ... + 6665999.

It is an arithmetic number, because the mean of its divisors is an integer number (1880879406480).

Almost surely, 2^{19749135999999} is an apocalyptic number.

19749135999999 is a deficient number, since it is larger than the sum of its proper divisors (10344934503681).

19749135999999 is a wasteful number, since it uses less digits than its factorization.

19749135999999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4655630.

The product of its digits is 18079622820, while the sum is 93.

The spelling of 19749135999999 in words is "nineteen trillion, seven hundred forty-nine billion, one hundred thirty-five million, nine hundred ninety-nine thousand, nine hundred ninety-nine".