19509426545 has 16 divisors (see below), whose sum is σ = 26760961920. Its totient is φ = 13375304064.

The previous prime is 19509426533. The next prime is 19509426569. The reversal of 19509426545 is 54562490591.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 19509426545 - 2⁴ = 19509426529 is a prime.

It is a super-2 number, since 2×19509426545² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 19509426493 and 19509426502.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 139301 + ... + 241709.

It is an arithmetic number, because the mean of its divisors is an integer number (1672560120).

Almost surely, 2^19509426545 is an apocalyptic number.

It is an amenable number.

19509426545 is a deficient number, since it is larger than the sum of its proper divisors (7251535375).

19509426545 is a wasteful number, since it uses less digits than its factorization.

19509426545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107864.

The product of its (nonzero) digits is 1944000, while the sum is 50.

The spelling of 19509426545 in words is "nineteen billion, five hundred nine million, four hundred twenty-six thousand, five hundred forty-five".