2646400805 has 4 divisors (see below), whose sum is σ = 3175680972. Its totient is φ = 2117120640.

The previous prime is 2646400793. The next prime is 2646400811. The reversal of 2646400805 is 5080046462.

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 1865030596 + 781370209 = 43186^2 + 27953^2 .

It is not a de Polignac number, because 2646400805 - 2⁴ = 2646400789 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 264640076 + ... + 264640085.

It is an arithmetic number, because the mean of its divisors is an integer number (793920243).

Almost surely, 2^2646400805 is an apocalyptic number.

It is an amenable number.

2646400805 is a deficient number, since it is larger than the sum of its proper divisors (529280167).

2646400805 is an equidigital number, since it uses as much as digits as its factorization.

2646400805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 529280166.

The product of its (nonzero) digits is 46080, while the sum is 35.

The square root of 2646400805 is about 51443.1803546398. The cubic root of 2646400805 is about 1383.2007210500.

The spelling of 2646400805 in words is "two billion, six hundred forty-six million, four hundred thousand, eight hundred five".