743503661 has 2 divisors, whose sum is σ = 743503662. Its totient is φ = 743503660.

The previous prime is 743503639. The next prime is 743503679. The reversal of 743503661 is 166305347.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 712356100 + 31147561 = 26690^2 + 5581^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-743503661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (743503361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 371751830 + 371751831.

It is an arithmetic number, because the mean of its divisors is an integer number (371751831).

Almost surely, 2^743503661 is an apocalyptic number.

It is an amenable number.

743503661 is a deficient number, since it is larger than the sum of its proper divisors (1).

743503661 is an equidigital number, since it uses as much as digits as its factorization.

743503661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 35.

The square root of 743503661 is about 27267.2635407369. The cubic root of 743503661 is about 905.9294343271.

The spelling of 743503661 in words is "seven hundred forty-three million, five hundred three thousand, six hundred sixty-one".