665355250505 has 16 divisors (see below), whose sum is σ = 916853169600. Its totient is φ = 458426583360.

The previous prime is 665355250501. The next prime is 665355250537. The reversal of 665355250505 is 505052553566.

665355250505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 665355250505 - 2² = 665355250501 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 665355250505.

It is not an unprimeable number, because it can be changed into a prime (665355250501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 318350750 + ... + 318352839.

It is an arithmetic number, because the mean of its divisors is an integer number (57303323100).

Almost surely, 2^665355250505 is an apocalyptic number.

It is an amenable number.

665355250505 is a deficient number, since it is larger than the sum of its proper divisors (251497919095).

665355250505 is a wasteful number, since it uses less digits than its factorization.

665355250505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636703624.

The product of its (nonzero) digits is 3375000, while the sum is 47.

The spelling of 665355250505 in words is "six hundred sixty-five billion, three hundred fifty-five million, two hundred fifty thousand, five hundred five".