2620163121265 has 4 divisors (see below), whose sum is σ = 3144195745524. Its totient is φ = 2096130497008.

The previous prime is 2620163121263. The next prime is 2620163121347. The reversal of 2620163121265 is 5621213610262.

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 1524839704336 + 1095323416929 = 1234844^2 + 1046577^2 .

It is a cyclic number.

It is not a de Polignac number, because 2620163121265 - 2¹ = 2620163121263 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2620163121263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 262016312122 + ... + 262016312131.

It is an arithmetic number, because the mean of its divisors is an integer number (786048936381).

Almost surely, 2^{2620163121265} is an apocalyptic number.

It is an amenable number.

2620163121265 is a deficient number, since it is larger than the sum of its proper divisors (524032624259).

2620163121265 is an equidigital number, since it uses as much as digits as its factorization.

2620163121265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524032624258.

The product of its (nonzero) digits is 51840, while the sum is 37.

The spelling of 2620163121265 in words is "two trillion, six hundred twenty billion, one hundred sixty-three million, one hundred twenty-one thousand, two hundred sixty-five".