1897497483257 has 4 divisors (see below), whose sum is σ = 1923490599540. Its totient is φ = 1871504366976.

The previous prime is 1897497483197. The next prime is 1897497483281. The reversal of 1897497483257 is 7523847947981.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 618198497536 + 1279298985721 = 786256^2 + 1131061^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1897497483257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1897497480257) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12996558032 + ... + 12996558177.

It is an arithmetic number, because the mean of its divisors is an integer number (480872649885).

Almost surely, 2^{1897497483257} is an apocalyptic number.

It is an amenable number.

1897497483257 is a deficient number, since it is larger than the sum of its proper divisors (25993116283).

1897497483257 is an equidigital number, since it uses as much as digits as its factorization.

1897497483257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25993116282.

The product of its digits is 853493760, while the sum is 74.

The spelling of 1897497483257 in words is "one trillion, eight hundred ninety-seven billion, four hundred ninety-seven million, four hundred eighty-three thousand, two hundred fifty-seven".