718846661 has 4 divisors (see below), whose sum is σ = 774142572. Its totient is φ = 663550752.

The previous prime is 718846603. The next prime is 718846663. The reversal of 718846661 is 166648817.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 32092225 + 686754436 = 5665^2 + 26206^2 .

It is a cyclic number.

It is not a de Polignac number, because 718846661 - 2¹⁰ = 718845637 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 (718846663) 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, 27647936 + ... + 27647961.

It is an arithmetic number, because the mean of its divisors is an integer number (193535643).

Almost surely, 2^718846661 is an apocalyptic number.

It is an amenable number.

718846661 is a deficient number, since it is larger than the sum of its proper divisors (55295911).

718846661 is a wasteful number, since it uses less digits than its factorization.

718846661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55295910.

The product of its digits is 387072, while the sum is 47.

The square root of 718846661 is about 26811.3159132483. The cubic root of 718846661 is about 895.8021214312.

The spelling of 718846661 in words is "seven hundred eighteen million, eight hundred forty-six thousand, six hundred sixty-one".