2665001999 has 4 divisors (see below), whose sum is σ = 2907274920. Its totient is φ = 2422729080.

The previous prime is 2665001993. The next prime is 2665002023. The reversal of 2665001999 is 9991005662.

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

It is a cyclic number.

It is not a de Polignac number, because 2665001999 - 2²⁴ = 2648224783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2665001993) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 121136444 + ... + 121136465.

It is an arithmetic number, because the mean of its divisors is an integer number (726818730).

Almost surely, 2^2665001999 is an apocalyptic number.

2665001999 is a deficient number, since it is larger than the sum of its proper divisors (242272921).

2665001999 is a wasteful number, since it uses less digits than its factorization.

2665001999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242272920.

The product of its (nonzero) digits is 262440, while the sum is 47.

The square root of 2665001999 is about 51623.6573578432. The cubic root of 2665001999 is about 1386.4339346134.

The spelling of 2665001999 in words is "two billion, six hundred sixty-five million, one thousand, nine hundred ninety-nine".