724601661 has 12 divisors (see below), whose sum is σ = 1123872192. Its totient is φ = 414058008.

The previous prime is 724601653. The next prime is 724601671. The reversal of 724601661 is 166106427.

724601661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 724601661 - 2³ = 724601653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (724601611) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2464485 + ... + 2464778.

It is an arithmetic number, because the mean of its divisors is an integer number (93656016).

Almost surely, 2^724601661 is an apocalyptic number.

It is an amenable number.

724601661 is a deficient number, since it is larger than the sum of its proper divisors (399270531).

724601661 is a wasteful number, since it uses less digits than its factorization.

724601661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4929280 (or 4929273 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 724601661 is about 26918.4260498269. The cubic root of 724601661 is about 898.1863315242.

The spelling of 724601661 in words is "seven hundred twenty-four million, six hundred one thousand, six hundred sixty-one".