661501452133 has 2 divisors, whose sum is σ = 661501452134. Its totient is φ = 661501452132.

The previous prime is 661501452127. The next prime is 661501452149. The reversal of 661501452133 is 331254105166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 661500808929 + 643204 = 813327^2 + 802^2 .

It is a cyclic number.

It is not a de Polignac number, because 661501452133 - 2⁹ = 661501451621 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 661501452092 and 661501452101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (661501452113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330750726066 + 330750726067.

It is an arithmetic number, because the mean of its divisors is an integer number (330750726067).

Almost surely, 2^661501452133 is an apocalyptic number.

It is an amenable number.

661501452133 is a deficient number, since it is larger than the sum of its proper divisors (1).

661501452133 is an equidigital number, since it uses as much as digits as its factorization.

661501452133 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64800, while the sum is 37.

Adding to 661501452133 its reverse (331254105166), we get a palindrome (992755557299).

The spelling of 661501452133 in words is "six hundred sixty-one billion, five hundred one million, four hundred fifty-two thousand, one hundred thirty-three".