19897605356 has 6 divisors (see below), whose sum is σ = 34820809380. Its totient is φ = 9948802676.

The previous prime is 19897605349. The next prime is 19897605359. The reversal of 19897605356 is 65350679891.

It is a junction number, because it is equal to n+sod(n) for n = 19897605295 and 19897605304.

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 as a sum of consecutive naturals, namely, 2487200666 + ... + 2487200673.

It is an arithmetic number, because the mean of its divisors is an integer number (5803468230).

Almost surely, 2^19897605356 is an apocalyptic number.

It is an amenable number.

19897605356 is a deficient number, since it is larger than the sum of its proper divisors (14923204024).

19897605356 is a wasteful number, since it uses less digits than its factorization.

19897605356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4974401343 (or 4974401341 counting only the distinct ones).

The product of its (nonzero) digits is 12247200, while the sum is 59.

The spelling of 19897605356 in words is "nineteen billion, eight hundred ninety-seven million, six hundred five thousand, three hundred fifty-six".