19694650093 has 4 divisors (see below), whose sum is σ = 20853158940. Its totient is φ = 18536141248.

The previous prime is 19694650091. The next prime is 19694650097. The reversal of 19694650093 is 39005649691.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39005649691 = 61121 ⋅638171.

It can be written as a sum of positive squares in 2 ways, for example, as 8338977124 + 11355672969 = 91318^2 + 106563^2 .

It is a cyclic number.

It is not a de Polignac number, because 19694650093 - 2¹ = 19694650091 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19694650093.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19694650091) 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 3 ways as a sum of consecutive naturals, for example, 579254398 + ... + 579254431.

It is an arithmetic number, because the mean of its divisors is an integer number (5213289735).

Almost surely, 2^19694650093 is an apocalyptic number.

It is an amenable number.

19694650093 is a deficient number, since it is larger than the sum of its proper divisors (1158508847).

19694650093 is a wasteful number, since it uses less digits than its factorization.

19694650093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1158508846.

The product of its (nonzero) digits is 1574640, while the sum is 52.

The spelling of 19694650093 in words is "nineteen billion, six hundred ninety-four million, six hundred fifty thousand, ninety-three".