724166661 has 16 divisors (see below), whose sum is σ = 1008161280. Its totient is φ = 461501040.

The previous prime is 724166657. The next prime is 724166669. The reversal of 724166661 is 166661427.

It is not a de Polignac number, because 724166661 - 2² = 724166657 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (724166669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 201006 + ... + 204576.

It is an arithmetic number, because the mean of its divisors is an integer number (63010080).

Almost surely, 2^724166661 is an apocalyptic number.

It is an amenable number.

724166661 is a deficient number, since it is larger than the sum of its proper divisors (283994619).

724166661 is a wasteful number, since it uses less digits than its factorization.

724166661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6536.

The product of its digits is 72576, while the sum is 39.

The square root of 724166661 is about 26910.3448695850. The cubic root of 724166661 is about 898.0065595260.

The spelling of 724166661 in words is "seven hundred twenty-four million, one hundred sixty-six thousand, six hundred sixty-one".