744765661 has 2 divisors, whose sum is σ = 744765662. Its totient is φ = 744765660.

The previous prime is 744765643. The next prime is 744765677. The reversal of 744765661 is 166567447.

744765661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 427248900 + 317516761 = 20670^2 + 17819^2 .

It is a cyclic number.

It is not a de Polignac number, because 744765661 - 2¹³ = 744757469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (744765061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 372382830 + 372382831.

It is an arithmetic number, because the mean of its divisors is an integer number (372382831).

Almost surely, 2^744765661 is an apocalyptic number.

It is an amenable number.

744765661 is a deficient number, since it is larger than the sum of its proper divisors (1).

744765661 is an equidigital number, since it uses as much as digits as its factorization.

744765661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 846720, while the sum is 46.

The square root of 744765661 is about 27290.3950319522. The cubic root of 744765661 is about 906.4417100821.

The spelling of 744765661 in words is "seven hundred forty-four million, seven hundred sixty-five thousand, six hundred sixty-one".