20145207615353 has 4 divisors (see below), whose sum is σ = 20148368645988. Its totient is φ = 20142046584720.

The previous prime is 20145207615349. The next prime is 20145207615359. The reversal of 20145207615353 is 35351670254102.

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 10367904125929 + 9777303489424 = 3219923^2 + 3126868^2 .

It is a cyclic number.

It is not a de Polignac number, because 20145207615353 - 2² = 20145207615349 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20145207615359) 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, 1580505758 + ... + 1580518503.

It is an arithmetic number, because the mean of its divisors is an integer number (5037092161497).

Almost surely, 2^{20145207615353} is an apocalyptic number.

It is an amenable number.

20145207615353 is a deficient number, since it is larger than the sum of its proper divisors (3161030635).

20145207615353 is an equidigital number, since it uses as much as digits as its factorization.

20145207615353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3161030634.

The product of its (nonzero) digits is 756000, while the sum is 44.

Adding to 20145207615353 its reverse (35351670254102), we get a palindrome (55496877869455).

The spelling of 20145207615353 in words is "twenty trillion, one hundred forty-five billion, two hundred seven million, six hundred fifteen thousand, three hundred fifty-three".