220717442545 has 24 divisors (see below), whose sum is σ = 272383865208. Its totient is φ = 171693734400.

The previous prime is 220717442503. The next prime is 220717442549. The reversal of 220717442545 is 545244717022.

It can be written as a sum of positive squares in 12 ways, for example, as 177315856 + 220540126689 = 13316^2 + 469617^2 .

It is not a de Polignac number, because 220717442545 - 2⁷ = 220717442417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220717442549) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11907885 + ... + 11926405.

It is an arithmetic number, because the mean of its divisors is an integer number (11349327717).

Almost surely, 2^220717442545 is an apocalyptic number.

It is an amenable number.

220717442545 is a deficient number, since it is larger than the sum of its proper divisors (51666422663).

220717442545 is a wasteful number, since it uses less digits than its factorization.

220717442545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20341 (or 20304 counting only the distinct ones).

The product of its (nonzero) digits is 627200, while the sum is 43.

The spelling of 220717442545 in words is "two hundred twenty billion, seven hundred seventeen million, four hundred forty-two thousand, five hundred forty-five".