661803281119 has 2 divisors, whose sum is σ = 661803281120. Its totient is φ = 661803281118.

The previous prime is 661803281071. The next prime is 661803281143. The reversal of 661803281119 is 911182308166.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 661803281119 - 2³⁷ = 524364327647 is a prime.

It is a super-2 number, since 2×661803281119² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (661803201119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330901640559 + 330901640560.

It is an arithmetic number, because the mean of its divisors is an integer number (330901640560).

Almost surely, 2^661803281119 is an apocalyptic number.

661803281119 is a deficient number, since it is larger than the sum of its proper divisors (1).

661803281119 is an equidigital number, since it uses as much as digits as its factorization.

661803281119 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 124416, while the sum is 46.

The spelling of 661803281119 in words is "six hundred sixty-one billion, eight hundred three million, two hundred eighty-one thousand, one hundred nineteen".