1980280669 has 2 divisors, whose sum is σ = 1980280670. Its totient is φ = 1980280668.

The previous prime is 1980280619. The next prime is 1980280693. The reversal of 1980280669 is 9660820891.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1942605625 + 37675044 = 44075^2 + 6138^2 .

It is a cyclic number.

It is not a de Polignac number, because 1980280669 - 2⁷ = 1980280541 is a prime.

It is a super-2 number, since 2×1980280669² = 7843023056030175122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1980280619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 990140334 + 990140335.

It is an arithmetic number, because the mean of its divisors is an integer number (990140335).

Almost surely, 2^1980280669 is an apocalyptic number.

It is an amenable number.

1980280669 is a deficient number, since it is larger than the sum of its proper divisors (1).

1980280669 is an equidigital number, since it uses as much as digits as its factorization.

1980280669 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 373248, while the sum is 49.

The square root of 1980280669 is about 44500.3445941714. The cubic root of 1980280669 is about 1255.7665658531.

The spelling of 1980280669 in words is "one billion, nine hundred eighty million, two hundred eighty thousand, six hundred sixty-nine".