1665214501 has 2 divisors, whose sum is σ = 1665214502. Its totient is φ = 1665214500.

The previous prime is 1665214487. The next prime is 1665214531. The reversal of 1665214501 is 1054125661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1664558401 + 656100 = 40799^2 + 810^2 .

It is an emirp because it is prime and its reverse (1054125661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1665214501 - 2⁷ = 1665214373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1665214531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832607250 + 832607251.

It is an arithmetic number, because the mean of its divisors is an integer number (832607251).

Almost surely, 2^1665214501 is an apocalyptic number.

It is an amenable number.

1665214501 is a deficient number, since it is larger than the sum of its proper divisors (1).

1665214501 is an equidigital number, since it uses as much as digits as its factorization.

1665214501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 1665214501 is about 40807.0398460854. The cubic root of 1665214501 is about 1185.2866548828.

The spelling of 1665214501 in words is "one billion, six hundred sixty-five million, two hundred fourteen thousand, five hundred one".