19452585109 has 4 divisors (see below), whose sum is σ = 19452878604. Its totient is φ = 19452291616.

The previous prime is 19452585101. The next prime is 19452585203. The reversal of 19452585109 is 90158525491.

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 2 ways, for example, as 9931119025 + 9521466084 = 99655^2 + 97578^2 .

It is a cyclic number.

It is not a de Polignac number, because 19452585109 - 2³ = 19452585101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19452585101) 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, 4929 + ... + 197305.

It is an arithmetic number, because the mean of its divisors is an integer number (4863219651).

Almost surely, 2^19452585109 is an apocalyptic number.

It is an amenable number.

19452585109 is a deficient number, since it is larger than the sum of its proper divisors (293495).

19452585109 is a wasteful number, since it uses less digits than its factorization.

19452585109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293494.

The product of its (nonzero) digits is 648000, while the sum is 49.

The spelling of 19452585109 in words is "nineteen billion, four hundred fifty-two million, five hundred eighty-five thousand, one hundred nine".