18709820649939 has 16 divisors (see below), whose sum is σ = 25003514592000. Its totient is φ = 12444684427680.

The previous prime is 18709820649893. The next prime is 18709820649953. The reversal of 18709820649939 is 93994602890781.

It is not a de Polignac number, because 18709820649939 - 2⁸ = 18709820649683 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18709820649139) 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, 3508129 + ... + 7051709.

It is an arithmetic number, because the mean of its divisors is an integer number (1562719662000).

Almost surely, 2^{18709820649939} is an apocalyptic number.

18709820649939 is a deficient number, since it is larger than the sum of its proper divisors (6293693942061).

18709820649939 is a wasteful number, since it uses less digits than its factorization.

18709820649939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3547610.

The product of its (nonzero) digits is 423263232, while the sum is 75.

The spelling of 18709820649939 in words is "eighteen trillion, seven hundred nine billion, eight hundred twenty million, six hundred forty-nine thousand, nine hundred thirty-nine".