1217180485573 has 18 divisors (see below), whose sum is σ = 1330957512486. Its totient is φ = 1106539453008.

The previous prime is 1217180485553. The next prime is 1217180485579. The reversal of 1217180485573 is 3755840817121.

It can be written as a sum of positive squares in only one way, i.e., 842663413089 + 374517072484 = 917967^2 + 611978^2 .

It is not a de Polignac number, because 1217180485573 - 2⁹ = 1217180485061 is a prime.

It is a super-2 number, since 2×1217180485573² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1217180485573.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1217180485579) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 266514136 + ... + 266518702.

It is an arithmetic number, because the mean of its divisors is an integer number (73942084027).

Almost surely, 2^{1217180485573} is an apocalyptic number.

1217180485573 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1217180485573 is a deficient number, since it is larger than the sum of its proper divisors (113777026913).

1217180485573 is an frugal number, since it uses more digits than its factorization.

1217180485573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9281 (or 4647 counting only the distinct ones).

The product of its (nonzero) digits is 1881600, while the sum is 52.

Multiplying 1217180485573 by its sum of digits (52), we get a square (63293385249796 = 7955714²).

The spelling of 1217180485573 in words is "one trillion, two hundred seventeen billion, one hundred eighty million, four hundred eighty-five thousand, five hundred seventy-three".