1896594454561 has 3 divisors (see below), whose sum is σ = 1896595831731. Its totient is φ = 1896593077392.

The previous prime is 1896594454549. The next prime is 1896594454609. The reversal of 1896594454561 is 1654544956981.

The square root of 1896594454561 is 1377169.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 1201038454561 + 695556000000 = 1095919^2 + 834000^2 .

It is not a de Polignac number, because 1896594454561 - 2²¹ = 1896592357409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1896594454061) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 688585 + ... + 2065753.

It is an arithmetic number, because the mean of its divisors is an integer number (632198610577).

Almost surely, 2^{1896594454561} is an apocalyptic number.

1896594454561 is the 1377169-th square number.

1896594454561 is the 688585-th centered octagonal number.

It is an amenable number.

1896594454561 is a deficient number, since it is larger than the sum of its proper divisors (1377170).

1896594454561 is an frugal number, since it uses more digits than its factorization.

1896594454561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2754338 (or 1377169 counting only the distinct ones).

The product of its digits is 186624000, while the sum is 67.

The spelling of 1896594454561 in words is "one trillion, eight hundred ninety-six billion, five hundred ninety-four million, four hundred fifty-four thousand, five hundred sixty-one".