743716661 has 16 divisors (see below), whose sum is σ = 787273344. Its totient is φ = 701167104.

The previous prime is 743716643. The next prime is 743716679. The reversal of 743716661 is 166617347.

743716661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (743716643) and next prime (743716679).

It is a cyclic number.

It is not a de Polignac number, because 743716661 - 2¹⁴ = 743700277 is a prime.

It is a super-2 number, since 2×743716661² = 1106228943697977842, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (743716361) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 572765 + ... + 574061.

It is an arithmetic number, because the mean of its divisors is an integer number (49204584).

Almost surely, 2^743716661 is an apocalyptic number.

It is an amenable number.

743716661 is a deficient number, since it is larger than the sum of its proper divisors (43556683).

743716661 is a wasteful number, since it uses less digits than its factorization.

743716661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1660.

The product of its digits is 127008, while the sum is 41.

The square root of 743716661 is about 27271.1690435155. The cubic root of 743716661 is about 906.0159367237.

The spelling of 743716661 in words is "seven hundred forty-three million, seven hundred sixteen thousand, six hundred sixty-one".