1217518345089 has 12 divisors (see below), whose sum is σ = 1770440548500. Its totient is φ = 806231386464.

The previous prime is 1217518345049. The next prime is 1217518345097. The reversal of 1217518345089 is 9805438157121.

1217518345089 is a `hidden beast` number, since 1 + 2 + 1 + 7 + 5 + 183 + 450 + 8 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 742411426689 + 475106918400 = 861633^2 + 689280^2 .

It is not a de Polignac number, because 1217518345089 - 2¹² = 1217518340993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1217518345049) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 453957774 + ... + 453960455.

It is an arithmetic number, because the mean of its divisors is an integer number (147536712375).

Almost surely, 2^{1217518345089} is an apocalyptic number.

It is an amenable number.

1217518345089 is a deficient number, since it is larger than the sum of its proper divisors (552922203411).

1217518345089 is a wasteful number, since it uses less digits than its factorization.

1217518345089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 907918384 (or 907918381 counting only the distinct ones).

The product of its (nonzero) digits is 2419200, while the sum is 54.

The spelling of 1217518345089 in words is "one trillion, two hundred seventeen billion, five hundred eighteen million, three hundred forty-five thousand, eighty-nine".