1665055129 has 2 divisors, whose sum is σ = 1665055130. Its totient is φ = 1665055128.

The previous prime is 1665055127. The next prime is 1665055153. The reversal of 1665055129 is 9215505661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1612825600 + 52229529 = 40160^2 + 7227^2 .

It is a cyclic number.

It is not a de Polignac number, because 1665055129 - 2¹ = 1665055127 is a prime.

Together with 1665055127, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1665055091 and 1665055100.

It is not a weakly prime, because it can be changed into another prime (1665055127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832527564 + 832527565.

It is an arithmetic number, because the mean of its divisors is an integer number (832527565).

Almost surely, 2^1665055129 is an apocalyptic number.

It is an amenable number.

1665055129 is a deficient number, since it is larger than the sum of its proper divisors (1).

1665055129 is an equidigital number, since it uses as much as digits as its factorization.

1665055129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81000, while the sum is 40.

The square root of 1665055129 is about 40805.0870480630. The cubic root of 1665055129 is about 1185.2488404288.

The spelling of 1665055129 in words is "one billion, six hundred sixty-five million, fifty-five thousand, one hundred twenty-nine".