665133081425 has 6 divisors (see below), whose sum is σ = 824765020998. Its totient is φ = 532106465120.

The previous prime is 665133081419. The next prime is 665133081439. The reversal of 665133081425 is 524180331566.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 374964496 + 664758116929 = 19364^2 + 815327^2 .

It is not a de Polignac number, because 665133081425 - 2²² = 665128887121 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13302661604 + ... + 13302661653.

It is an arithmetic number, because the mean of its divisors is an integer number (137460836833).

Almost surely, 2^665133081425 is an apocalyptic number.

It is an amenable number.

665133081425 is a deficient number, since it is larger than the sum of its proper divisors (159631939573).

665133081425 is a wasteful number, since it uses less digits than its factorization.

665133081425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26605323267 (or 26605323262 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 44.

The spelling of 665133081425 in words is "six hundred sixty-five billion, one hundred thirty-three million, eighty-one thousand, four hundred twenty-five".