19475197893397 has 2 divisors, whose sum is σ = 19475197893398. Its totient is φ = 19475197893396.

The previous prime is 19475197893367. The next prime is 19475197893439. The reversal of 19475197893397 is 79339879157491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15189929425476 + 4285268467921 = 3897426^2 + 2070089^2 .

It is a cyclic number.

It is not a de Polignac number, because 19475197893397 - 2¹⁹ = 19475197369109 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19475197893397.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19475197893367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9737598946698 + 9737598946699.

It is an arithmetic number, because the mean of its divisors is an integer number (9737598946699).

Almost surely, 2^{19475197893397} is an apocalyptic number.

It is an amenable number.

19475197893397 is a deficient number, since it is larger than the sum of its proper divisors (1).

19475197893397 is an equidigital number, since it uses as much as digits as its factorization.

19475197893397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3240609120, while the sum is 82.

The spelling of 19475197893397 in words is "nineteen trillion, four hundred seventy-five billion, one hundred ninety-seven million, eight hundred ninety-three thousand, three hundred ninety-seven".