19782618807 has 16 divisors (see below), whose sum is σ = 30213624320. Its totient is φ = 11278598112.

The previous prime is 19782618781. The next prime is 19782618809. The reversal of 19782618807 is 70881628791.

It is not a de Polignac number, because 19782618807 - 2⁸ = 19782618551 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 (19782618809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1063708 + ... + 1082145.

It is an arithmetic number, because the mean of its divisors is an integer number (1888351520).

Almost surely, 2^19782618807 is an apocalyptic number.

19782618807 is a deficient number, since it is larger than the sum of its proper divisors (10431005513).

19782618807 is a wasteful number, since it uses less digits than its factorization.

19782618807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2146302.

The product of its (nonzero) digits is 2709504, while the sum is 57.

The spelling of 19782618807 in words is "nineteen billion, seven hundred eighty-two million, six hundred eighteen thousand, eight hundred seven".