19945525049 has 4 divisors (see below), whose sum is σ = 19949190900. Its totient is φ = 19941859200.

The previous prime is 19945525013. The next prime is 19945525069. The reversal of 19945525049 is 94052554991.

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 2590097449 + 17355427600 = 50893^2 + 131740^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19945525049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19945525069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1824752 + ... + 1835649.

It is an arithmetic number, because the mean of its divisors is an integer number (4987297725).

Almost surely, 2^19945525049 is an apocalyptic number.

It is an amenable number.

19945525049 is a deficient number, since it is larger than the sum of its proper divisors (3665851).

19945525049 is an equidigital number, since it uses as much as digits as its factorization.

19945525049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3665850.

The product of its (nonzero) digits is 2916000, while the sum is 53.

The spelling of 19945525049 in words is "nineteen billion, nine hundred forty-five million, five hundred twenty-five thousand, forty-nine".