2705905661 has 4 divisors (see below), whose sum is σ = 2706153024. Its totient is φ = 2705658300.

The previous prime is 2705905627. The next prime is 2705905663. The reversal of 2705905661 is 1665095072.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2705905661 - 2⁶ = 2705905597 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 (2705905663) 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, 106475 + ... + 129416.

It is an arithmetic number, because the mean of its divisors is an integer number (676538256).

Almost surely, 2^2705905661 is an apocalyptic number.

It is an amenable number.

2705905661 is a deficient number, since it is larger than the sum of its proper divisors (247363).

2705905661 is a wasteful number, since it uses less digits than its factorization.

2705905661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247362.

The product of its (nonzero) digits is 113400, while the sum is 41.

The square root of 2705905661 is about 52018.3204361694. The cubic root of 2705905661 is about 1393.4911570740.

The spelling of 2705905661 in words is "two billion, seven hundred five million, nine hundred five thousand, six hundred sixty-one".