18688593437 has 4 divisors (see below), whose sum is σ = 18689979900. Its totient is φ = 18687206976.

The previous prime is 18688593421. The next prime is 18688593461. The reversal of 18688593437 is 73439588681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 73439588681 = 43331 ⋅1694851.

It can be written as a sum of positive squares in 2 ways, for example, as 1976836 + 18686616601 = 1406^2 + 136699^2 .

It is a cyclic number.

It is not a de Polignac number, because 18688593437 - 2⁴ = 18688593421 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 18688593437.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18688599437) 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 3 ways as a sum of consecutive naturals, for example, 672812 + ... + 700037.

It is an arithmetic number, because the mean of its divisors is an integer number (4672494975).

Almost surely, 2^18688593437 is an apocalyptic number.

It is an amenable number.

18688593437 is a deficient number, since it is larger than the sum of its proper divisors (1386463).

18688593437 is a wasteful number, since it uses less digits than its factorization.

18688593437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1386462.

The product of its digits is 34836480, while the sum is 62.

The spelling of 18688593437 in words is "eighteen billion, six hundred eighty-eight million, five hundred ninety-three thousand, four hundred thirty-seven".