19368605081 has 16 divisors (see below), whose sum is σ = 22780636416. Its totient is φ = 16119694656.

The previous prime is 19368605071. The next prime is 19368605089. The reversal of 19368605081 is 18050686391.

It is a cyclic number.

It is not a de Polignac number, because 19368605081 - 2¹⁸ = 19368342937 is a prime.

It is a super-2 number, since 2×19368605081² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19368605089) by changing a digit.

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, 49355 + ... + 202911.

It is an arithmetic number, because the mean of its divisors is an integer number (1423789776).

Almost surely, 2^19368605081 is an apocalyptic number.

It is an amenable number.

19368605081 is a deficient number, since it is larger than the sum of its proper divisors (3412031335).

19368605081 is a wasteful number, since it uses less digits than its factorization.

19368605081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154088.

The product of its (nonzero) digits is 311040, while the sum is 47.

The spelling of 19368605081 in words is "nineteen billion, three hundred sixty-eight million, six hundred five thousand, eighty-one".