2785320840646 has 4 divisors (see below), whose sum is σ = 4177981260972. Its totient is φ = 1392660420322.

The previous prime is 2785320840559. The next prime is 2785320840707. The reversal of 2785320840646 is 6460480235872.

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

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 696330210160 + ... + 696330210163.

It is an arithmetic number, because the mean of its divisors is an integer number (1044495315243).

Almost surely, 2^{2785320840646} is an apocalyptic number.

2785320840646 is a deficient number, since it is larger than the sum of its proper divisors (1392660420326).

2785320840646 is a wasteful number, since it uses less digits than its factorization.

2785320840646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1392660420325.

The product of its (nonzero) digits is 15482880, while the sum is 55.

The spelling of 2785320840646 in words is "two trillion, seven hundred eighty-five billion, three hundred twenty million, eight hundred forty thousand, six hundred forty-six".