2645321272973 has 4 divisors (see below), whose sum is σ = 2645360716188. Its totient is φ = 2645281829760.

The previous prime is 2645321272963. The next prime is 2645321272991. The reversal of 2645321272973 is 3792721235462.

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 2625832275364 + 19488997609 = 1620442^2 + 139603^2 .

It is a cyclic number.

It is not a de Polignac number, because 2645321272973 - 2¹⁰ = 2645321271949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2645321272963) 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, 19620836 + ... + 19755197.

It is an arithmetic number, because the mean of its divisors is an integer number (661340179047).

Almost surely, 2^{2645321272973} is an apocalyptic number.

It is an amenable number.

2645321272973 is a deficient number, since it is larger than the sum of its proper divisors (39443215).

2645321272973 is an equidigital number, since it uses as much as digits as its factorization.

2645321272973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39443214.

The product of its digits is 7620480, while the sum is 53.

The spelling of 2645321272973 in words is "two trillion, six hundred forty-five billion, three hundred twenty-one million, two hundred seventy-two thousand, nine hundred seventy-three".