20145545331553 has 4 divisors (see below), whose sum is σ = 20147680986628. Its totient is φ = 20143409676480.

The previous prime is 20145545331523. The next prime is 20145545331607. The reversal of 20145545331553 is 35513354554102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6628503369744 + 13517041961809 = 2574588^2 + 3676553^2 .

It is a cyclic number.

It is not a de Polignac number, because 20145545331553 - 2¹³ = 20145545323361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20145545331523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1067813388 + ... + 1067832253.

It is an arithmetic number, because the mean of its divisors is an integer number (5036920246657).

Almost surely, 2^{20145545331553} is an apocalyptic number.

It is an amenable number.

20145545331553 is a deficient number, since it is larger than the sum of its proper divisors (2135655075).

20145545331553 is an equidigital number, since it uses as much as digits as its factorization.

20145545331553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2135655074.

The product of its (nonzero) digits is 2700000, while the sum is 46.

Adding to 20145545331553 its reverse (35513354554102), we get a palindrome (55658899885655).

The spelling of 20145545331553 in words is "twenty trillion, one hundred forty-five billion, five hundred forty-five million, three hundred thirty-one thousand, five hundred fifty-three".