1880065981 has 2 divisors, whose sum is σ = 1880065982. Its totient is φ = 1880065980.

The previous prime is 1880065973. The next prime is 1880065987. The reversal of 1880065981 is 1895600881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1041094756 + 838971225 = 32266^2 + 28965^2 .

It is a cyclic number.

It is not a de Polignac number, because 1880065981 - 2³ = 1880065973 is a prime.

It is a super-2 number, since 2×1880065981² = 7069296185826984722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1880065987) 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, 940032990 + 940032991.

It is an arithmetic number, because the mean of its divisors is an integer number (940032991).

Almost surely, 2^1880065981 is an apocalyptic number.

It is an amenable number.

1880065981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1880065981 is an equidigital number, since it uses as much as digits as its factorization.

1880065981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 138240, while the sum is 46.

The square root of 1880065981 is about 43359.7276398273. The cubic root of 1880065981 is about 1234.2155970082.

The spelling of 1880065981 in words is "one billion, eight hundred eighty million, sixty-five thousand, nine hundred eighty-one".