665194936425 has 96 divisors (see below), whose sum is σ = 1216645939200. Its totient is φ = 319522579200.

The previous prime is 665194936423. The next prime is 665194936459. The reversal of 665194936425 is 524639491566.

It is not a de Polignac number, because 665194936425 - 2¹ = 665194936423 is a prime.

It is not an unprimeable number, because it can be changed into a prime (665194936423) by changing a digit.

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 95 ways as a sum of consecutive naturals, for example, 1810476 + ... + 2146674.

It is an arithmetic number, because the mean of its divisors is an integer number (12673395200).

Almost surely, 2^665194936425 is an apocalyptic number.

It is an amenable number.

665194936425 is a deficient number, since it is larger than the sum of its proper divisors (551451002775).

665194936425 is a wasteful number, since it uses less digits than its factorization.

665194936425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336303 (or 336298 counting only the distinct ones).

The product of its digits is 41990400, while the sum is 60.

The spelling of 665194936425 in words is "six hundred sixty-five billion, one hundred ninety-four million, nine hundred thirty-six thousand, four hundred twenty-five".