19782007065 has 24 divisors (see below), whose sum is σ = 34507224648. Its totient is φ = 10483200000.

The previous prime is 19782007031. The next prime is 19782007081. The reversal of 19782007065 is 56070028791.

It can be written as a sum of positive squares in 4 ways, for example, as 1430428041 + 18351579024 = 37821^2 + 135468^2 .

It is not a de Polignac number, because 19782007065 - 2¹⁴ = 19781990681 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 19782007065.

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 23 ways as a sum of consecutive naturals, for example, 1392936 + ... + 1407065.

It is an arithmetic number, because the mean of its divisors is an integer number (1437801027).

Almost surely, 2^19782007065 is an apocalyptic number.

19782007065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19782007065 is a deficient number, since it is larger than the sum of its proper divisors (14725217583).

19782007065 is a wasteful number, since it uses less digits than its factorization.

19782007065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2800169 (or 2800166 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 45.

The spelling of 19782007065 in words is "nineteen billion, seven hundred eighty-two million, seven thousand, sixty-five".