1218587243651 has 2 divisors, whose sum is σ = 1218587243652. Its totient is φ = 1218587243650.

The previous prime is 1218587243641. The next prime is 1218587243681. The reversal of 1218587243651 is 1563427858121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1218587243651 - 2²² = 1218583049347 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1218587243593 and 1218587243602.

It is not a weakly prime, because it can be changed into another prime (1218587243641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 609293621825 + 609293621826.

It is an arithmetic number, because the mean of its divisors is an integer number (609293621826).

Almost surely, 2^{1218587243651} is an apocalyptic number.

1218587243651 is a deficient number, since it is larger than the sum of its proper divisors (1).

1218587243651 is an equidigital number, since it uses as much as digits as its factorization.

1218587243651 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3225600, while the sum is 53.

The spelling of 1218587243651 in words is "one trillion, two hundred eighteen billion, five hundred eighty-seven million, two hundred forty-three thousand, six hundred fifty-one".