2644204406451 has 4 divisors (see below), whose sum is σ = 3525605875272. Its totient is φ = 1762802937632.

The previous prime is 2644204406419. The next prime is 2644204406453. The reversal of 2644204406451 is 1546044024462.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2644204406451 - 2⁵ = 2644204406419 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2644204406453) 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, 440700734406 + ... + 440700734411.

It is an arithmetic number, because the mean of its divisors is an integer number (881401468818).

Almost surely, 2^{2644204406451} is an apocalyptic number.

2644204406451 is a deficient number, since it is larger than the sum of its proper divisors (881401468821).

2644204406451 is an equidigital number, since it uses as much as digits as its factorization.

2644204406451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 881401468820.

The product of its (nonzero) digits is 737280, while the sum is 42.

The spelling of 2644204406451 in words is "two trillion, six hundred forty-four billion, two hundred four million, four hundred six thousand, four hundred fifty-one".