19879734563485 has 16 divisors (see below), whose sum is σ = 23955473449152. Its totient is φ = 15837284800000.

The previous prime is 19879734563473. The next prime is 19879734563567. The reversal of 19879734563485 is 58436543797891.

It is not a de Polignac number, because 19879734563485 - 2⁹ = 19879734562973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4770957 + ... + 7907053.

It is an arithmetic number, because the mean of its divisors is an integer number (1497217090572).

Almost surely, 2^{19879734563485} is an apocalyptic number.

It is an amenable number.

19879734563485 is a deficient number, since it is larger than the sum of its proper divisors (4075738885667).

19879734563485 is a wasteful number, since it uses less digits than its factorization.

19879734563485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3141404.

The product of its digits is 5486745600, while the sum is 79.

The spelling of 19879734563485 in words is "nineteen trillion, eight hundred seventy-nine billion, seven hundred thirty-four million, five hundred sixty-three thousand, four hundred eighty-five".