1665534125 has 16 divisors (see below), whose sum is σ = 2082328560. Its totient is φ = 1330028800.

The previous prime is 1665534113. The next prime is 1665534127. The reversal of 1665534125 is 5214355661.

It can be written as a sum of positive squares in 8 ways, for example, as 903663721 + 761870404 = 30061^2 + 27602^2 .

It is not a de Polignac number, because 1665534125 - 2⁴ = 1665534109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665534127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59417 + ... + 82833.

It is an arithmetic number, because the mean of its divisors is an integer number (130145535).

Almost surely, 2^1665534125 is an apocalyptic number.

It is an amenable number.

1665534125 is a deficient number, since it is larger than the sum of its proper divisors (416794435).

1665534125 is an equidigital number, since it uses as much as digits as its factorization.

1665534125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24001 (or 23991 counting only the distinct ones).

The product of its digits is 108000, while the sum is 38.

The square root of 1665534125 is about 40810.9559432268. The cubic root of 1665534125 is about 1185.3624853189.

Adding to 1665534125 its reverse (5214355661), we get a palindrome (6879889786).

The spelling of 1665534125 in words is "one billion, six hundred sixty-five million, five hundred thirty-four thousand, one hundred twenty-five".