19891345559377 has 16 divisors (see below), whose sum is σ = 20607639335424. Its totient is φ = 19179727056000.

The previous prime is 19891345559353. The next prime is 19891345559399. The reversal of 19891345559377 is 77395554319891.

It is a cyclic number.

It is not a de Polignac number, because 19891345559377 - 2²⁷ = 19891211341649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19891345559347) 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 15 ways as a sum of consecutive naturals, for example, 124844838 + ... + 125004064.

It is an arithmetic number, because the mean of its divisors is an integer number (1287977458464).

Almost surely, 2^{19891345559377} is an apocalyptic number.

It is an amenable number.

19891345559377 is a deficient number, since it is larger than the sum of its proper divisors (716293776047).

19891345559377 is a wasteful number, since it uses less digits than its factorization.

19891345559377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173880.

The product of its digits is 1285956000, while the sum is 76.

The spelling of 19891345559377 in words is "nineteen trillion, eight hundred ninety-one billion, three hundred forty-five million, five hundred fifty-nine thousand, three hundred seventy-seven".