2643685445 has 8 divisors (see below), whose sum is σ = 3176754936. Its totient is φ = 2112060096.

The previous prime is 2643685423. The next prime is 2643685489. The reversal of 2643685445 is 5445863462.

It can be written as a sum of positive squares in 4 ways, for example, as 308669761 + 2335015684 = 17569^2 + 48322^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2643685445 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2643685445.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 357002 + ... + 364331.

It is an arithmetic number, because the mean of its divisors is an integer number (397094367).

Almost surely, 2^2643685445 is an apocalyptic number.

It is an amenable number.

2643685445 is a deficient number, since it is larger than the sum of its proper divisors (533069491).

2643685445 is an equidigital number, since it uses as much as digits as its factorization.

2643685445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 722071.

The product of its digits is 2764800, while the sum is 47.

The square root of 2643685445 is about 51416.7817448739. The cubic root of 2643685445 is about 1382.7274778913.

The spelling of 2643685445 in words is "two billion, six hundred forty-three million, six hundred eighty-five thousand, four hundred forty-five".