19897605352 has 8 divisors (see below), whose sum is σ = 37308010050. Its totient is φ = 9948802672.

The previous prime is 19897605349. The next prime is 19897605359. The reversal of 19897605352 is 25350679891.

It can be written as a sum of positive squares in only one way, i.e., 14243467716 + 5654137636 = 119346^2 + 75194^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 19897605293 and 19897605302.

It is not an unprimeable number, because it can be changed into a prime (19897605359) 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 as a sum of consecutive naturals, namely, 1243600327 + ... + 1243600342.

Almost surely, 2^19897605352 is an apocalyptic number.

It is an amenable number.

19897605352 is a deficient number, since it is larger than the sum of its proper divisors (17410404698).

19897605352 is a wasteful number, since it uses less digits than its factorization.

19897605352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2487200675 (or 2487200671 counting only the distinct ones).

The product of its (nonzero) digits is 4082400, while the sum is 55.

The spelling of 19897605352 in words is "nineteen billion, eight hundred ninety-seven million, six hundred five thousand, three hundred fifty-two".