661202532533 has 2 divisors, whose sum is σ = 661202532534. Its totient is φ = 661202532532.

The previous prime is 661202532509. The next prime is 661202532583. The reversal of 661202532533 is 335235202166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 364649315044 + 296553217489 = 603862^2 + 544567^2 .

It is a cyclic number.

It is not a de Polignac number, because 661202532533 - 2²⁸ = 660934097077 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (661202532583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330601266266 + 330601266267.

It is an arithmetic number, because the mean of its divisors is an integer number (330601266267).

Almost surely, 2^661202532533 is an apocalyptic number.

It is an amenable number.

661202532533 is a deficient number, since it is larger than the sum of its proper divisors (1).

661202532533 is an equidigital number, since it uses as much as digits as its factorization.

661202532533 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 194400, while the sum is 38.

Adding to 661202532533 its reverse (335235202166), we get a palindrome (996437734699).

The spelling of 661202532533 in words is "six hundred sixty-one billion, two hundred two million, five hundred thirty-two thousand, five hundred thirty-three".