661116052823 has 2 divisors, whose sum is σ = 661116052824. Its totient is φ = 661116052822.

The previous prime is 661116052787. The next prime is 661116052841. The reversal of 661116052823 is 328250611166.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 661116052823 - 2⁶ = 661116052759 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (661116052423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330558026411 + 330558026412.

It is an arithmetic number, because the mean of its divisors is an integer number (330558026412).

Almost surely, 2^661116052823 is an apocalyptic number.

661116052823 is a deficient number, since it is larger than the sum of its proper divisors (1).

661116052823 is an equidigital number, since it uses as much as digits as its factorization.

661116052823 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 103680, while the sum is 41.

Adding to 661116052823 its reverse (328250611166), we get a palindrome (989366663989).

The spelling of 661116052823 in words is "six hundred sixty-one billion, one hundred sixteen million, fifty-two thousand, eight hundred twenty-three".