690660653 has 2 divisors, whose sum is σ = 690660654. Its totient is φ = 690660652.

The previous prime is 690660647. The next prime is 690660757. The reversal of 690660653 is 356066096.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 688695049 + 1965604 = 26243^2 + 1402^2 .

It is a cyclic number.

It is not a de Polignac number, because 690660653 - 2¹² = 690656557 is a prime.

It is a super-3 number, since 3×690660653³ (a number of 27 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 690660653.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (690660643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345330326 + 345330327.

It is an arithmetic number, because the mean of its divisors is an integer number (345330327).

Almost surely, 2^690660653 is an apocalyptic number.

It is an amenable number.

690660653 is a deficient number, since it is larger than the sum of its proper divisors (1).

690660653 is an equidigital number, since it uses as much as digits as its factorization.

690660653 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 174960, while the sum is 41.

The square root of 690660653 is about 26280.4233793902. The cubic root of 690660653 is about 883.9375262969.

The spelling of 690660653 in words is "six hundred ninety million, six hundred sixty thousand, six hundred fifty-three".