19040688145 has 8 divisors (see below), whose sum is σ = 23051028456. Its totient is φ = 15097748736.

The previous prime is 19040688133. The next prime is 19040688167. The reversal of 19040688145 is 54188604091.

It is a Cunningham number, because it is equal to 137988²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 1 + 19040688144 = 1^2 + 137988^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19040688145 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19040688095 and 19040688104.

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 7 ways as a sum of consecutive naturals, for example, 16849602 + ... + 16850731.

It is an arithmetic number, because the mean of its divisors is an integer number (2881378557).

Almost surely, 2^19040688145 is an apocalyptic number.

It is an amenable number.

19040688145 is a deficient number, since it is larger than the sum of its proper divisors (4010340311).

19040688145 is a wasteful number, since it uses less digits than its factorization.

19040688145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33700451.

The product of its (nonzero) digits is 276480, while the sum is 46.

The spelling of 19040688145 in words is "nineteen billion, forty million, six hundred eighty-eight thousand, one hundred forty-five".