1664546701 has 2 divisors, whose sum is σ = 1664546702. Its totient is φ = 1664546700.

The previous prime is 1664546693. The next prime is 1664546729. The reversal of 1664546701 is 1076454661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1102904100 + 561642601 = 33210^2 + 23699^2 .

It is a cyclic number.

It is not a de Polignac number, because 1664546701 - 2³ = 1664546693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1664541701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832273350 + 832273351.

It is an arithmetic number, because the mean of its divisors is an integer number (832273351).

Almost surely, 2^1664546701 is an apocalyptic number.

It is an amenable number.

1664546701 is a deficient number, since it is larger than the sum of its proper divisors (1).

1664546701 is an equidigital number, since it uses as much as digits as its factorization.

1664546701 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 1664546701 is about 40798.8566138807. The cubic root of 1664546701 is about 1185.1281887591.

The spelling of 1664546701 in words is "one billion, six hundred sixty-four million, five hundred forty-six thousand, seven hundred one".