2640354856873 has 4 divisors (see below), whose sum is σ = 2640942521028. Its totient is φ = 2639767192720.

The previous prime is 2640354856871. The next prime is 2640354856891. The reversal of 2640354856873 is 3786584530462.

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 2621717965584 + 18636891289 = 1619172^2 + 136517^2 .

It is a cyclic number.

It is not a de Polignac number, because 2640354856873 - 2¹ = 2640354856871 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2640354856871) 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, 293825338 + ... + 293834323.

It is an arithmetic number, because the mean of its divisors is an integer number (660235630257).

Almost surely, 2^{2640354856873} is an apocalyptic number.

It is an amenable number.

2640354856873 is a deficient number, since it is larger than the sum of its proper divisors (587664155).

2640354856873 is an equidigital number, since it uses as much as digits as its factorization.

2640354856873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 587664154.

The product of its (nonzero) digits is 116121600, while the sum is 61.

The spelling of 2640354856873 in words is "two trillion, six hundred forty billion, three hundred fifty-four million, eight hundred fifty-six thousand, eight hundred seventy-three".