1925445921809 has 4 divisors (see below), whose sum is σ = 1925487252480. Its totient is φ = 1925404591140.

The previous prime is 1925445921781. The next prime is 1925445921877. The reversal of 1925445921809 is 9081295445291.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1925445921809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1925445920809) 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, 20595377 + ... + 20688654.

It is an arithmetic number, because the mean of its divisors is an integer number (481371813120).

Almost surely, 2^{1925445921809} is an apocalyptic number.

It is an amenable number.

1925445921809 is a deficient number, since it is larger than the sum of its proper divisors (41330671).

1925445921809 is an equidigital number, since it uses as much as digits as its factorization.

1925445921809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41330670.

The product of its (nonzero) digits is 9331200, while the sum is 59.

The spelling of 1925445921809 in words is "one trillion, nine hundred twenty-five billion, four hundred forty-five million, nine hundred twenty-one thousand, eight hundred nine".