1664546837 has 2 divisors, whose sum is σ = 1664546838. Its totient is φ = 1664546836.

The previous prime is 1664546773. The next prime is 1664546879. The reversal of 1664546837 is 7386454661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1432319716 + 232227121 = 37846^2 + 15239^2 .

It is a cyclic number.

It is not a de Polignac number, because 1664546837 - 2⁶ = 1664546773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1664546887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832273418 + 832273419.

It is an arithmetic number, because the mean of its divisors is an integer number (832273419).

Almost surely, 2^1664546837 is an apocalyptic number.

It is an amenable number.

1664546837 is a deficient number, since it is larger than the sum of its proper divisors (1).

1664546837 is an equidigital number, since it uses as much as digits as its factorization.

1664546837 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2903040, while the sum is 50.

The square root of 1664546837 is about 40798.8582805941. The cubic root of 1664546837 is about 1185.1282210357.

The spelling of 1664546837 in words is "one billion, six hundred sixty-four million, five hundred forty-six thousand, eight hundred thirty-seven".