720463561 has 2 divisors, whose sum is σ = 720463562. Its totient is φ = 720463560.

The previous prime is 720463531. The next prime is 720463567. The reversal of 720463561 is 165364027.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 646176400 + 74287161 = 25420^2 + 8619^2 .

It is a cyclic number.

It is not a de Polignac number, because 720463561 - 2⁷ = 720463433 is a prime.

It is not a weakly prime, because it can be changed into another prime (720463567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360231780 + 360231781.

It is an arithmetic number, because the mean of its divisors is an integer number (360231781).

Almost surely, 2^720463561 is an apocalyptic number.

It is an amenable number.

720463561 is a deficient number, since it is larger than the sum of its proper divisors (1).

720463561 is an equidigital number, since it uses as much as digits as its factorization.

720463561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 720463561 is about 26841.4522893229. The cubic root of 720463561 is about 896.4732603105.

The spelling of 720463561 in words is "seven hundred twenty million, four hundred sixty-three thousand, five hundred sixty-one".