17778112245 has 24 divisors (see below), whose sum is σ = 30832645272. Its totient is φ = 9476352000.

The previous prime is 17778112217. The next prime is 17778112309. The reversal of 17778112245 is 54221187771.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2522651076 + 15255461169 = 50226^2 + 123513^2 .

It is not a de Polignac number, because 17778112245 - 2⁶ = 17778112181 is a prime.

It is a super-2 number, since 2×17778112245² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 17778112245.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28636 + ... + 190725.

It is an arithmetic number, because the mean of its divisors is an integer number (1284693553).

Almost surely, 2^17778112245 is an apocalyptic number.

17778112245 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

17778112245 is a deficient number, since it is larger than the sum of its proper divisors (13054533027).

17778112245 is a wasteful number, since it uses less digits than its factorization.

17778112245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221173 (or 221170 counting only the distinct ones).

The product of its digits is 219520, while the sum is 45.

The spelling of 17778112245 in words is "seventeen billion, seven hundred seventy-eight million, one hundred twelve thousand, two hundred forty-five".