2689665545 has 16 divisors (see below), whose sum is σ = 3690749568. Its totient is φ = 1843309440.

The previous prime is 2689665541. The next prime is 2689665577. The reversal of 2689665545 is 5455669862.

It is not a de Polignac number, because 2689665545 - 2² = 2689665541 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2689665541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44765 + ... + 85925.

It is an arithmetic number, because the mean of its divisors is an integer number (230671848).

Almost surely, 2^2689665545 is an apocalyptic number.

It is an amenable number.

2689665545 is a deficient number, since it is larger than the sum of its proper divisors (1001084023).

2689665545 is a wasteful number, since it uses less digits than its factorization.

2689665545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43040.

The product of its digits is 15552000, while the sum is 56.

The square root of 2689665545 is about 51861.9855481836. The cubic root of 2689665545 is about 1390.6977751890.

The spelling of 2689665545 in words is "two billion, six hundred eighty-nine million, six hundred sixty-five thousand, five hundred forty-five".