20640115006361 has 4 divisors (see below), whose sum is σ = 20922856307892. Its totient is φ = 20357373704832.

The previous prime is 20640115006351. The next prime is 20640115006367. The reversal of 20640115006361 is 16360051104602.

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 16240738800400 + 4399376205961 = 4029980^2 + 2097469^2 .

It is a cyclic number.

It is not a de Polignac number, because 20640115006361 - 2⁶ = 20640115006297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20640115006367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 141370650656 + ... + 141370650801.

It is an arithmetic number, because the mean of its divisors is an integer number (5230714076973).

Almost surely, 2^{20640115006361} is an apocalyptic number.

It is an amenable number.

20640115006361 is a deficient number, since it is larger than the sum of its proper divisors (282741301531).

20640115006361 is an equidigital number, since it uses as much as digits as its factorization.

20640115006361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282741301530.

The product of its (nonzero) digits is 25920, while the sum is 35.

The spelling of 20640115006361 in words is "twenty trillion, six hundred forty billion, one hundred fifteen million, six thousand, three hundred sixty-one".