18806015837 has 4 divisors (see below), whose sum is σ = 21492589536. Its totient is φ = 16119442140.

The previous prime is 18806015821. The next prime is 18806015881. The reversal of 18806015837 is 73851060881.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 73851060881 = 13 ⋅5680850837.

It is a cyclic number.

It is not a de Polignac number, because 18806015837 - 2⁴ = 18806015821 is a prime.

It is a super-2 number, since 2×18806015837² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18806015791 and 18806015800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18806015237) 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, 1343286839 + ... + 1343286852.

It is an arithmetic number, because the mean of its divisors is an integer number (5373147384).

Almost surely, 2^18806015837 is an apocalyptic number.

It is an amenable number.

18806015837 is a deficient number, since it is larger than the sum of its proper divisors (2686573699).

18806015837 is an equidigital number, since it uses as much as digits as its factorization.

18806015837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2686573698.

The product of its (nonzero) digits is 322560, while the sum is 47.

The spelling of 18806015837 in words is "eighteen billion, eight hundred six million, fifteen thousand, eight hundred thirty-seven".