19891350124708 has 6 divisors (see below), whose sum is σ = 34809862718246. Its totient is φ = 9945675062352.

The previous prime is 19891350124703. The next prime is 19891350124753. The reversal of 19891350124708 is 80742105319891.

It can be written as a sum of positive squares in only one way, i.e., 18496003287204 + 1395346837504 = 4300698^2 + 1181248^2 .

It is not an unprimeable number, because it can be changed into a prime (19891350124703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2486418765585 + ... + 2486418765592.

Almost surely, 2^{19891350124708} is an apocalyptic number.

It is an amenable number.

19891350124708 is a deficient number, since it is larger than the sum of its proper divisors (14918512593538).

19891350124708 is a wasteful number, since it uses less digits than its factorization.

19891350124708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4972837531181 (or 4972837531179 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 58.

The spelling of 19891350124708 in words is "nineteen trillion, eight hundred ninety-one billion, three hundred fifty million, one hundred twenty-four thousand, seven hundred eight".