1665528329 has 2 divisors, whose sum is σ = 1665528330. Its totient is φ = 1665528328.

The previous prime is 1665528251. The next prime is 1665528341. The reversal of 1665528329 is 9238255661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1646168329 + 19360000 = 40573^2 + 4400^2 .

It is an emirp because it is prime and its reverse (9238255661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1665528329 - 2¹⁶ = 1665462793 is a prime.

It is a super-2 number, since 2×1665528329² = 5547969229403064482, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1665528349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832764164 + 832764165.

It is an arithmetic number, because the mean of its divisors is an integer number (832764165).

Almost surely, 2^1665528329 is an apocalyptic number.

It is an amenable number.

1665528329 is a deficient number, since it is larger than the sum of its proper divisors (1).

1665528329 is an equidigital number, since it uses as much as digits as its factorization.

1665528329 is an evil number, because the sum of its binary digits is even.

The product of its digits is 777600, while the sum is 47.

The square root of 1665528329 is about 40810.8849328215. The cubic root of 1665528329 is about 1185.3611103108.

The spelling of 1665528329 in words is "one billion, six hundred sixty-five million, five hundred twenty-eight thousand, three hundred twenty-nine".