2661043345 has 8 divisors (see below), whose sum is σ = 3253502376. Its totient is φ = 2088667776.

The previous prime is 2661043339. The next prime is 2661043369. The reversal of 2661043345 is 5433401662.

It can be written as a sum of positive squares in 4 ways, for example, as 1141291089 + 1519752256 = 33783^2 + 38984^2 .

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 2661043345 - 2²⁹ = 2124172433 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2661043345.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5020572 + ... + 5021101.

It is an arithmetic number, because the mean of its divisors is an integer number (406687797).

Almost surely, 2^2661043345 is an apocalyptic number.

It is an amenable number.

2661043345 is a deficient number, since it is larger than the sum of its proper divisors (592459031).

2661043345 is a wasteful number, since it uses less digits than its factorization.

2661043345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10041731.

The product of its (nonzero) digits is 51840, while the sum is 34.

The square root of 2661043345 is about 51585.3016371912. The cubic root of 2661043345 is about 1385.7471143628.

The spelling of 2661043345 in words is "two billion, six hundred sixty-one million, forty-three thousand, three hundred forty-five".