716661405 has 64 divisors (see below), whose sum is σ = 1310515200. Its totient is φ = 371407680.

The previous prime is 716661403. The next prime is 716661409. The reversal of 716661405 is 504166617.

It is not a de Polignac number, because 716661405 - 2¹ = 716661403 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 716661405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (716661403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1135440 + ... + 1136070.

It is an arithmetic number, because the mean of its divisors is an integer number (20476800).

Almost surely, 2^716661405 is an apocalyptic number.

It is an amenable number.

716661405 is a deficient number, since it is larger than the sum of its proper divisors (593853795).

716661405 is a wasteful number, since it uses less digits than its factorization.

716661405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 871 (or 865 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 716661405 is about 26770.5324003838. The cubic root of 716661405 is about 894.8934696295.

The spelling of 716661405 in words is "seven hundred sixteen million, six hundred sixty-one thousand, four hundred five".