19897605357 has 16 divisors (see below), whose sum is σ = 30322814592. Its totient is φ = 11369064960.

The previous prime is 19897605349. The next prime is 19897605359. The reversal of 19897605357 is 75350679891.

It is not a de Polignac number, because 19897605357 - 2³ = 19897605349 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19897605357.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19897605359) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 252673 + ... + 321929.

It is an arithmetic number, because the mean of its divisors is an integer number (1895175912).

Almost surely, 2^19897605357 is an apocalyptic number.

It is an amenable number.

19897605357 is a deficient number, since it is larger than the sum of its proper divisors (10425209235).

19897605357 is a wasteful number, since it uses less digits than its factorization.

19897605357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82948.

The product of its (nonzero) digits is 14288400, while the sum is 60.

The spelling of 19897605357 in words is "nineteen billion, eight hundred ninety-seven million, six hundred five thousand, three hundred fifty-seven".