1897897543425 has 72 divisors (see below), whose sum is σ = 3662343345024. Its totient is φ = 933964202880.

The previous prime is 1897897543403. The next prime is 1897897543453. The reversal of 1897897543425 is 5243457987981.

1897897543425 is a `hidden beast` number, since 1 + 8 + 9 + 78 + 9 + 7 + 543 + 4 + 2 + 5 = 666.

It is not a de Polignac number, because 1897897543425 - 2⁸ = 1897897543169 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 7024894 + ... + 7290056.

It is an arithmetic number, because the mean of its divisors is an integer number (50865879792).

Almost surely, 2^{1897897543425} is an apocalyptic number.

1897897543425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1897897543425 is a deficient number, since it is larger than the sum of its proper divisors (1764445801599).

1897897543425 is a wasteful number, since it uses less digits than its factorization.

1897897543425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267639 (or 267631 counting only the distinct ones).

The product of its digits is 609638400, while the sum is 72.

The spelling of 1897897543425 in words is "one trillion, eight hundred ninety-seven billion, eight hundred ninety-seven million, five hundred forty-three thousand, four hundred twenty-five".