665152251566 has 24 divisors (see below), whose sum is σ = 1110558660960. Its totient is φ = 298514810880.

The previous prime is 665152251563. The next prime is 665152251593.

665152251566 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665152251563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17376851 + ... + 17415086.

It is an arithmetic number, because the mean of its divisors is an integer number (46273277540).

Almost surely, 2^665152251566 is an apocalyptic number.

665152251566 is a deficient number, since it is larger than the sum of its proper divisors (445406409394).

665152251566 is a wasteful number, since it uses less digits than its factorization.

665152251566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34792040 (or 34792029 counting only the distinct ones).

The product of its digits is 3240000, while the sum is 50.

The spelling of 665152251566 in words is "six hundred sixty-five billion, one hundred fifty-two million, two hundred fifty-one thousand, five hundred sixty-six".