2665209894 has 16 divisors (see below), whose sum is σ = 5332122432. Its totient is φ = 888119528.

The previous prime is 2665209829. The next prime is 2665209941. The reversal of 2665209894 is 4989025662.

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 in 7 ways as a sum of consecutive naturals, for example, 50124 + ... + 88559.

It is an arithmetic number, because the mean of its divisors is an integer number (333257652).

Almost surely, 2^2665209894 is an apocalyptic number.

2665209894 is an abundant number, since it is smaller than the sum of its proper divisors (2666912538).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2665209894 is a wasteful number, since it uses less digits than its factorization.

2665209894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141891.

The product of its (nonzero) digits is 1866240, while the sum is 51.

The square root of 2665209894 is about 51625.6708818394. The cubic root of 2665209894 is about 1386.4699852666.

The spelling of 2665209894 in words is "two billion, six hundred sixty-five million, two hundred nine thousand, eight hundred ninety-four".