1218680499959 has 4 divisors (see below), whose sum is σ = 1312425153816. Its totient is φ = 1124935846104.

The previous prime is 1218680499943. The next prime is 1218680499989. The reversal of 1218680499959 is 9599940868121.

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

It is a cyclic number.

It is not a de Polignac number, because 1218680499959 - 2⁴ = 1218680499943 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1218680499892 and 1218680499901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218680499989) 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, 46872326909 + ... + 46872326934.

It is an arithmetic number, because the mean of its divisors is an integer number (328106288454).

Almost surely, 2^{1218680499959} is an apocalyptic number.

1218680499959 is a deficient number, since it is larger than the sum of its proper divisors (93744653857).

1218680499959 is an equidigital number, since it uses as much as digits as its factorization.

1218680499959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93744653856.

The product of its (nonzero) digits is 100776960, while the sum is 71.

The spelling of 1218680499959 in words is "one trillion, two hundred eighteen billion, six hundred eighty million, four hundred ninety-nine thousand, nine hundred fifty-nine".