661109822803 has 2 divisors, whose sum is σ = 661109822804. Its totient is φ = 661109822802.

The previous prime is 661109822777. The next prime is 661109822831. The reversal of 661109822803 is 308228901166.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 661109822803 - 2²⁹ = 660572951891 is a prime.

It is a super-2 number, since 2×661109822803² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (661109820803) 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, 330554911401 + 330554911402.

It is an arithmetic number, because the mean of its divisors is an integer number (330554911402).

Almost surely, 2^661109822803 is an apocalyptic number.

661109822803 is a deficient number, since it is larger than the sum of its proper divisors (1).

661109822803 is an equidigital number, since it uses as much as digits as its factorization.

661109822803 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 248832, while the sum is 46.

The spelling of 661109822803 in words is "six hundred sixty-one billion, one hundred nine million, eight hundred twenty-two thousand, eight hundred three".