2665139039 has 4 divisors (see below), whose sum is σ = 2665797456. Its totient is φ = 2664480624.

The previous prime is 2665139033. The next prime is 2665139041. The reversal of 2665139039 is 9309315662.

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 2665139039 - 2¹² = 2665134943 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2665139033) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 323099 + ... + 331244.

It is an arithmetic number, because the mean of its divisors is an integer number (666449364).

Almost surely, 2^2665139039 is an apocalyptic number.

2665139039 is a deficient number, since it is larger than the sum of its proper divisors (658417).

2665139039 is an equidigital number, since it uses as much as digits as its factorization.

2665139039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 658416.

The product of its (nonzero) digits is 262440, while the sum is 44.

The square root of 2665139039 is about 51624.9846392229. The cubic root of 2665139039 is about 1386.4576986544.

The spelling of 2665139039 in words is "two billion, six hundred sixty-five million, one hundred thirty-nine thousand, thirty-nine".