2661415605 has 12 divisors (see below), whose sum is σ = 4613120460. Its totient is φ = 1419421632.

The previous prime is 2661415591. The next prime is 2661415643. The reversal of 2661415605 is 5065141662.

2661415605 is a `hidden beast` number, since 2 + 6 + 6 + 1 + 41 + 5 + 605 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 537219684 + 2124195921 = 23178^2 + 46089^2 .

It is not a de Polignac number, because 2661415605 - 2⁶ = 2661415541 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2661415605.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29571240 + ... + 29571329.

It is an arithmetic number, because the mean of its divisors is an integer number (384426705).

Almost surely, 2^2661415605 is an apocalyptic number.

It is an amenable number.

2661415605 is a deficient number, since it is larger than the sum of its proper divisors (1951704855).

2661415605 is a wasteful number, since it uses less digits than its factorization.

2661415605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59142580 (or 59142577 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 2661415605 is about 51588.9097093552. The cubic root of 2661415605 is about 1385.8117298915.

The spelling of 2661415605 in words is "two billion, six hundred sixty-one million, four hundred fifteen thousand, six hundred five".