1664028077 has 2 divisors, whose sum is σ = 1664028078. Its totient is φ = 1664028076.

The previous prime is 1664028029. The next prime is 1664028083. The reversal of 1664028077 is 7708204661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1627799716 + 36228361 = 40346^2 + 6019^2 .

It is a cyclic number.

It is not a de Polignac number, because 1664028077 - 2¹² = 1664023981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1664028097) 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, 832014038 + 832014039.

It is an arithmetic number, because the mean of its divisors is an integer number (832014039).

Almost surely, 2^1664028077 is an apocalyptic number.

It is an amenable number.

1664028077 is a deficient number, since it is larger than the sum of its proper divisors (1).

1664028077 is an equidigital number, since it uses as much as digits as its factorization.

1664028077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112896, while the sum is 41.

The square root of 1664028077 is about 40792.5002543360. The cubic root of 1664028077 is about 1185.0050922295.

The spelling of 1664028077 in words is "one billion, six hundred sixty-four million, twenty-eight thousand, seventy-seven".