19436542225 has 9 divisors (see below), whose sum is σ = 24102176763. Its totient is φ = 15548676120.

The previous prime is 19436542199. The next prime is 19436542267. The reversal of 19436542225 is 52224563491.

The square root of 19436542225 is 139415.

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

It can be written as a sum of positive squares in only one way, i.e., 6997155201 + 12439387024 = 83649^2 + 111532^2 .

It is not a de Polignac number, because 19436542225 - 2⁵ = 19436542193 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 683134 + ... + 711016.

Almost surely, 2^19436542225 is an apocalyptic number.

19436542225 is the 139415-th square number.

19436542225 is the 69708-th centered octagonal number.

It is an amenable number.

19436542225 is a deficient number, since it is larger than the sum of its proper divisors (4665634538).

19436542225 is an frugal number, since it uses more digits than its factorization.

19436542225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55776 (or 27888 counting only the distinct ones).

The product of its digits is 518400, while the sum is 43.

The spelling of 19436542225 in words is "nineteen billion, four hundred thirty-six million, five hundred forty-two thousand, two hundred twenty-five".