2665209945 has 8 divisors (see below), whose sum is σ = 4264335936. Its totient is φ = 1421445296.

The previous prime is 2665209941. The next prime is 2665209979. The reversal of 2665209945 is 5499025662.

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

It is a cyclic number.

It is not a de Polignac number, because 2665209945 - 2² = 2665209941 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2665209894 and 2665209903.

It is not an unprimeable number, because it can be changed into a prime (2665209941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88840317 + ... + 88840346.

It is an arithmetic number, because the mean of its divisors is an integer number (533041992).

Almost surely, 2^2665209945 is an apocalyptic number.

It is an amenable number.

2665209945 is a deficient number, since it is larger than the sum of its proper divisors (1599125991).

2665209945 is a wasteful number, since it uses less digits than its factorization.

2665209945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177680671.

The product of its (nonzero) digits is 1166400, while the sum is 48.

The square root of 2665209945 is about 51625.6713757797. The cubic root of 2665209945 is about 1386.4699941102.

The spelling of 2665209945 in words is "two billion, six hundred sixty-five million, two hundred nine thousand, nine hundred forty-five".