2085667645 has 4 divisors (see below), whose sum is σ = 2502801180. Its totient is φ = 1668534112.

The previous prime is 2085667621. The next prime is 2085667673. The reversal of 2085667645 is 5467665802.

It is a happy number.

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 774286276 + 1311381369 = 27826^2 + 36213^2 .

It is a cyclic number.

It is not a de Polignac number, because 2085667645 - 2¹¹ = 2085665597 is a prime.

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, 208566760 + ... + 208566769.

It is an arithmetic number, because the mean of its divisors is an integer number (625700295).

Almost surely, 2^2085667645 is an apocalyptic number.

It is an amenable number.

2085667645 is a deficient number, since it is larger than the sum of its proper divisors (417133535).

2085667645 is an equidigital number, since it uses as much as digits as its factorization.

2085667645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417133534.

The product of its (nonzero) digits is 2419200, while the sum is 49.

The square root of 2085667645 is about 45669.1104029846. The cubic root of 2085667645 is about 1277.6592239528.

The spelling of 2085667645 in words is "two billion, eighty-five million, six hundred sixty-seven thousand, six hundred forty-five".