665735120 has 40 divisors (see below), whose sum is σ = 1577048616. Its totient is φ = 261267968.

The previous prime is 665735101. The next prime is 665735131. The reversal of 665735120 is 21537566.

It can be written as a sum of positive squares in 4 ways, for example, as 162001984 + 503733136 = 12728^2 + 22444^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74267 + ... + 82746.

Almost surely, 2^665735120 is an apocalyptic number.

It is an amenable number.

665735120 is an abundant number, since it is smaller than the sum of its proper divisors (911313496).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665735120 is a wasteful number, since it uses less digits than its factorization.

665735120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157079 (or 157073 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 35.

The square root of 665735120 is about 25801.8433450015. The cubic root of 665735120 is about 873.1733845853.

The spelling of 665735120 in words is "six hundred sixty-five million, seven hundred thirty-five thousand, one hundred twenty".