19897065057 has 16 divisors (see below), whose sum is σ = 26980611840. Its totient is φ = 13040556672.

The previous prime is 19897065043. The next prime is 19897065059. The reversal of 19897065057 is 75056079891.

It is not a de Polignac number, because 19897065057 - 2²⁶ = 19829956193 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19897064988 and 19897065006.

It is not an unprimeable number, because it can be changed into a prime (19897065059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 124938 + ... + 235379.

It is an arithmetic number, because the mean of its divisors is an integer number (1686288240).

Almost surely, 2^19897065057 is an apocalyptic number.

It is an amenable number.

19897065057 is a deficient number, since it is larger than the sum of its proper divisors (7083546783).

19897065057 is a wasteful number, since it uses less digits than its factorization.

19897065057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360632.

The product of its (nonzero) digits is 4762800, while the sum is 57.

The spelling of 19897065057 in words is "nineteen billion, eight hundred ninety-seven million, sixty-five thousand, fifty-seven".