696606721 has 2 divisors, whose sum is σ = 696606722. Its totient is φ = 696606720.

The previous prime is 696606643. The next prime is 696606749. The reversal of 696606721 is 127606696.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 522762496 + 173844225 = 22864^2 + 13185^2 .

It is a cyclic number.

It is not a de Polignac number, because 696606721 - 2¹¹ = 696604673 is a prime.

It is not a weakly prime, because it can be changed into another prime (696646721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 348303360 + 348303361.

It is an arithmetic number, because the mean of its divisors is an integer number (348303361).

Almost surely, 2^696606721 is an apocalyptic number.

It is an amenable number.

696606721 is a deficient number, since it is larger than the sum of its proper divisors (1).

696606721 is an equidigital number, since it uses as much as digits as its factorization.

696606721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 43.

The square root of 696606721 is about 26393.3082617545. The cubic root of 696606721 is about 886.4669600511.

The spelling of 696606721 in words is "six hundred ninety-six million, six hundred six thousand, seven hundred twenty-one".