665552905 has 8 divisors (see below), whose sum is σ = 798801984. Its totient is φ = 532350000.

The previous prime is 665552903. The next prime is 665552911. The reversal of 665552905 is 509255566.

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

It is not a de Polignac number, because 665552905 - 2¹ = 665552903 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665552903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50340 + ... + 62170.

It is an arithmetic number, because the mean of its divisors is an integer number (99850248).

Almost surely, 2^665552905 is an apocalyptic number.

It is an amenable number.

665552905 is a deficient number, since it is larger than the sum of its proper divisors (133249079).

665552905 is a wasteful number, since it uses less digits than its factorization.

665552905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23087.

The product of its (nonzero) digits is 405000, while the sum is 43.

The square root of 665552905 is about 25798.3120571870. The cubic root of 665552905 is about 873.0937133559.

The spelling of 665552905 in words is "six hundred sixty-five million, five hundred fifty-two thousand, nine hundred five".