19901352718449 has 48 divisors (see below), whose sum is σ = 29918551062400. Its totient is φ = 12737445073920.

The previous prime is 19901352718447. The next prime is 19901352718451. The reversal of 19901352718449 is 94481725310991.

19901352718449 is a `hidden beast` number, since 1 + 9 + 90 + 1 + 3 + 527 + 18 + 4 + 4 + 9 = 666.

It is an interprime number because it is at equal distance from previous prime (19901352718447) and next prime (19901352718451).

It is not a de Polignac number, because 19901352718449 - 2¹ = 19901352718447 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19901352718447) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 32724897 + ... + 33327489.

Almost surely, 2^{19901352718449} is an apocalyptic number.

It is an amenable number.

19901352718449 is a deficient number, since it is larger than the sum of its proper divisors (10017198343951).

19901352718449 is a wasteful number, since it uses less digits than its factorization.

19901352718449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 604102 (or 604099 counting only the distinct ones).

The product of its (nonzero) digits is 19595520, while the sum is 63.

The spelling of 19901352718449 in words is "nineteen trillion, nine hundred one billion, three hundred fifty-two million, seven hundred eighteen thousand, four hundred forty-nine".