12018778509722 has 4 divisors (see below), whose sum is σ = 18028167764586. Its totient is φ = 6009389254860.

The previous prime is 12018778509653. The next prime is 12018778509739. The reversal of 12018778509722 is 22790587781021.

It is a Cunningham number, because it is equal to 3466811²+1.

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., 12018778509721 + 1 = 3466811^2 + 1^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3004694627429 + ... + 3004694627432.

Almost surely, 2^{12018778509722} is an apocalyptic number.

12018778509722 is a deficient number, since it is larger than the sum of its proper divisors (6009389254864).

12018778509722 is an equidigital number, since it uses as much as digits as its factorization.

12018778509722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6009389254863.

The product of its (nonzero) digits is 7902720, while the sum is 59.

The spelling of 12018778509722 in words is "twelve trillion, eighteen billion, seven hundred seventy-eight million, five hundred nine thousand, seven hundred twenty-two".