690866552533 has 2 divisors, whose sum is σ = 690866552534. Its totient is φ = 690866552532.

The previous prime is 690866552527. The next prime is 690866552567. The reversal of 690866552533 is 335255668096.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 522760812484 + 168105740049 = 723022^2 + 410007^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-690866552533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (690866552933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345433276266 + 345433276267.

It is an arithmetic number, because the mean of its divisors is an integer number (345433276267).

Almost surely, 2^690866552533 is an apocalyptic number.

It is an amenable number.

690866552533 is a deficient number, since it is larger than the sum of its proper divisors (1).

690866552533 is an equidigital number, since it uses as much as digits as its factorization.

690866552533 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992000, while the sum is 58.

The spelling of 690866552533 in words is "six hundred ninety billion, eight hundred sixty-six million, five hundred fifty-two thousand, five hundred thirty-three".