1218560933993 has 8 divisors (see below), whose sum is σ = 1312369158408. Its totient is φ = 1124763105024.

The previous prime is 1218560933977. The next prime is 1218560933999. The reversal of 1218560933993 is 3993390658121.

It can be written as a sum of positive squares in 4 ways, for example, as 7564128784 + 1210996805209 = 86972^2 + 1100453^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1218560933993 - 2⁴ = 1218560933977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1218560933999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2354546 + ... + 2825067.

It is an arithmetic number, because the mean of its divisors is an integer number (164046144801).

Almost surely, 2^{1218560933993} is an apocalyptic number.

1218560933993 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1218560933993 is a deficient number, since it is larger than the sum of its proper divisors (93808224415).

1218560933993 is a wasteful number, since it uses less digits than its factorization.

1218560933993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5197723.

The product of its (nonzero) digits is 9447840, while the sum is 59.

The spelling of 1218560933993 in words is "one trillion, two hundred eighteen billion, five hundred sixty million, nine hundred thirty-three thousand, nine hundred ninety-three".