705561661 has 8 divisors (see below), whose sum is σ = 826023744. Its totient is φ = 590016480.

The previous prime is 705561631. The next prime is 705561667. The reversal of 705561661 is 166165507.

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 705561661 - 2¹³ = 705553469 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 705561661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (705561667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1228915 + ... + 1229488.

It is an arithmetic number, because the mean of its divisors is an integer number (103252968).

Almost surely, 2^705561661 is an apocalyptic number.

It is an amenable number.

705561661 is a deficient number, since it is larger than the sum of its proper divisors (120462083).

705561661 is a wasteful number, since it uses less digits than its factorization.

705561661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2458451.

The product of its (nonzero) digits is 37800, while the sum is 37.

The square root of 705561661 is about 26562.4106774969. The cubic root of 705561661 is about 890.2493350991.

The spelling of 705561661 in words is "seven hundred five million, five hundred sixty-one thousand, six hundred sixty-one".