665794995541 has 8 divisors (see below), whose sum is σ = 719736272640. Its totient is φ = 612243186672.

The previous prime is 665794995539. The next prime is 665794995611. The reversal of 665794995541 is 145599497566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 665794995541 - 2¹ = 665794995539 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665794995641) 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, 97363501 + ... + 97370338.

It is an arithmetic number, because the mean of its divisors is an integer number (89967034080).

Almost surely, 2^665794995541 is an apocalyptic number.

It is an amenable number.

665794995541 is a deficient number, since it is larger than the sum of its proper divisors (53941277099).

665794995541 is a wasteful number, since it uses less digits than its factorization.

665794995541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194734115.

The product of its digits is 367416000, while the sum is 70.

The spelling of 665794995541 in words is "six hundred sixty-five billion, seven hundred ninety-four million, nine hundred ninety-five thousand, five hundred forty-one".