18787444922 has 4 divisors (see below), whose sum is σ = 28181167386. Its totient is φ = 9393722460.

The previous prime is 18787444919. The next prime is 18787444927. The reversal of 18787444922 is 22944478781.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 14417045041 + 4370399881 = 120071^2 + 66109^2 .

It is not an unprimeable number, because it can be changed into a prime (18787444927) 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, 4696861229 + ... + 4696861232.

Almost surely, 2^18787444922 is an apocalyptic number.

18787444922 is a deficient number, since it is larger than the sum of its proper divisors (9393722464).

18787444922 is an equidigital number, since it uses as much as digits as its factorization.

18787444922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9393722463.

The product of its digits is 7225344, while the sum is 56.

The spelling of 18787444922 in words is "eighteen billion, seven hundred eighty-seven million, four hundred forty-four thousand, nine hundred twenty-two".