726666749 has 2 divisors, whose sum is σ = 726666750. Its totient is φ = 726666748.

The previous prime is 726666719. The next prime is 726666763. The reversal of 726666749 is 947666627.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 724578724 + 2088025 = 26918^2 + 1445^2 .

It is an emirp because it is prime and its reverse (947666627) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-726666749 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 726666749.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (726666719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 363333374 + 363333375.

It is an arithmetic number, because the mean of its divisors is an integer number (363333375).

Almost surely, 2^726666749 is an apocalyptic number.

It is an amenable number.

726666749 is a deficient number, since it is larger than the sum of its proper divisors (1).

726666749 is an equidigital number, since it uses as much as digits as its factorization.

726666749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4572288, while the sum is 53.

The square root of 726666749 is about 26956.7570193449. The cubic root of 726666749 is about 899.0387881819.

The spelling of 726666749 in words is "seven hundred twenty-six million, six hundred sixty-six thousand, seven hundred forty-nine".