665194936426 has 16 divisors (see below), whose sum is σ = 1005299987328. Its totient is φ = 330102248400.

The previous prime is 665194936423. The next prime is 665194936459. The reversal of 665194936426 is 624639491566.

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 7 ways as a sum of consecutive naturals, for example, 1644510 + ... + 2008681.

It is an arithmetic number, because the mean of its divisors is an integer number (62831249208).

Almost surely, 2^665194936426 is an apocalyptic number.

665194936426 is a deficient number, since it is larger than the sum of its proper divisors (340105050902).

665194936426 is a wasteful number, since it uses less digits than its factorization.

665194936426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3653877.

The product of its digits is 50388480, while the sum is 61.

The spelling of 665194936426 in words is "six hundred sixty-five billion, one hundred ninety-four million, nine hundred thirty-six thousand, four hundred twenty-six".