699757661 has 2 divisors, whose sum is σ = 699757662. Its totient is φ = 699757660.

The previous prime is 699757649. The next prime is 699757673. The reversal of 699757661 is 166757996.

It is a balanced prime because it is at equal distance from previous prime (699757649) and next prime (699757673).

It can be written as a sum of positive squares in only one way, i.e., 433056100 + 266701561 = 20810^2 + 16331^2 .

It is a cyclic number.

It is not a de Polignac number, because 699757661 - 2¹⁰ = 699756637 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 699757597 and 699757606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (699757601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 349878830 + 349878831.

It is an arithmetic number, because the mean of its divisors is an integer number (349878831).

Almost surely, 2^699757661 is an apocalyptic number.

It is an amenable number.

699757661 is a deficient number, since it is larger than the sum of its proper divisors (1).

699757661 is an equidigital number, since it uses as much as digits as its factorization.

699757661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4286520, while the sum is 56.

The square root of 699757661 is about 26452.9329375780. The cubic root of 699757661 is about 887.8015262171.

The spelling of 699757661 in words is "six hundred ninety-nine million, seven hundred fifty-seven thousand, six hundred sixty-one".