19545230645 has 4 divisors (see below), whose sum is σ = 23454276780. Its totient is φ = 15636184512.

The previous prime is 19545230609. The next prime is 19545230671. The reversal of 19545230645 is 54603254591.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54603254591 = 1021 ⋅53480171.

It can be written as a sum of positive squares in 2 ways, for example, as 13389729796 + 6155500849 = 115714^2 + 78457^2 .

It is a cyclic number.

It is not a de Polignac number, because 19545230645 - 2²⁴ = 19528453429 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19545230596 and 19545230605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1954523060 + ... + 1954523069.

It is an arithmetic number, because the mean of its divisors is an integer number (5863569195).

Almost surely, 2^19545230645 is an apocalyptic number.

It is an amenable number.

19545230645 is a deficient number, since it is larger than the sum of its proper divisors (3909046135).

19545230645 is an equidigital number, since it uses as much as digits as its factorization.

19545230645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3909046134.

The product of its (nonzero) digits is 648000, while the sum is 44.

The spelling of 19545230645 in words is "nineteen billion, five hundred forty-five million, two hundred thirty thousand, six hundred forty-five".