18445715807 has 2 divisors, whose sum is σ = 18445715808. Its totient is φ = 18445715806.

The previous prime is 18445715803. The next prime is 18445715941. The reversal of 18445715807 is 70851754481.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18445715807 - 2² = 18445715803 is a prime.

It is a super-2 number, since 2×18445715807² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18445715803) 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 as a sum of consecutive naturals, namely, 9222857903 + 9222857904.

It is an arithmetic number, because the mean of its divisors is an integer number (9222857904).

Almost surely, 2^18445715807 is an apocalyptic number.

18445715807 is a deficient number, since it is larger than the sum of its proper divisors (1).

18445715807 is an equidigital number, since it uses as much as digits as its factorization.

18445715807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1254400, while the sum is 50.

The spelling of 18445715807 in words is "eighteen billion, four hundred forty-five million, seven hundred fifteen thousand, eight hundred seven".