1218797730547 has 4 divisors (see below), whose sum is σ = 1232492087160. Its totient is φ = 1205103373936.

The previous prime is 1218797730509. The next prime is 1218797730587. The reversal of 1218797730547 is 7450377978121.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1218797730547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1218797730587) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6847178173 + ... + 6847178350.

It is an arithmetic number, because the mean of its divisors is an integer number (308123021790).

Almost surely, 2^{1218797730547} is an apocalyptic number.

1218797730547 is a deficient number, since it is larger than the sum of its proper divisors (13694356613).

1218797730547 is an equidigital number, since it uses as much as digits as its factorization.

1218797730547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13694356612.

The product of its (nonzero) digits is 20744640, while the sum is 61.

The spelling of 1218797730547 in words is "one trillion, two hundred eighteen billion, seven hundred ninety-seven million, seven hundred thirty thousand, five hundred forty-seven".