705105661 has 4 divisors (see below), whose sum is σ = 759344572. Its totient is φ = 650866752.

The previous prime is 705105619. The next prime is 705105671. The reversal of 705105661 is 166501507.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 166501507 = 8623 ⋅19309.

It can be written as a sum of positive squares in 2 ways, for example, as 262634436 + 442471225 = 16206^2 + 21035^2 .

It is a cyclic number.

It is not a de Polignac number, because 705105661 - 2²⁵ = 671551229 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 (705105601) 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, 27119436 + ... + 27119461.

It is an arithmetic number, because the mean of its divisors is an integer number (189836143).

Almost surely, 2^705105661 is an apocalyptic number.

It is an amenable number.

705105661 is a deficient number, since it is larger than the sum of its proper divisors (54238911).

705105661 is a wasteful number, since it uses less digits than its factorization.

705105661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54238910.

The product of its (nonzero) digits is 6300, while the sum is 31.

The square root of 705105661 is about 26553.8257318978. The cubic root of 705105661 is about 890.0575062788.

The spelling of 705105661 in words is "seven hundred five million, one hundred five thousand, six hundred sixty-one".