1601665733 has 2 divisors, whose sum is σ = 1601665734. Its totient is φ = 1601665732.

The previous prime is 1601665711. The next prime is 1601665787. The reversal of 1601665733 is 3375661061.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1464822529 + 136843204 = 38273^2 + 11698^2 .

It is an emirp because it is prime and its reverse (3375661061) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1601665733 - 2¹⁴ = 1601649349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1601665633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 800832866 + 800832867.

It is an arithmetic number, because the mean of its divisors is an integer number (800832867).

Almost surely, 2^1601665733 is an apocalyptic number.

It is an amenable number.

1601665733 is a deficient number, since it is larger than the sum of its proper divisors (1).

1601665733 is an equidigital number, since it uses as much as digits as its factorization.

1601665733 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 68040, while the sum is 38.

The square root of 1601665733 is about 40020.8162460488. The cubic root of 1601665733 is about 1170.0128405828.

The spelling of 1601665733 in words is "one billion, six hundred one million, six hundred sixty-five thousand, seven hundred thirty-three".