665881359 has 32 divisors (see below), whose sum is σ = 1067345664. Its totient is φ = 363847680.

The previous prime is 665881343. The next prime is 665881387. The reversal of 665881359 is 953188566.

665881359 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 665881359 - 2⁴ = 665881343 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665881319) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 399 + ... + 36495.

It is an arithmetic number, because the mean of its divisors is an integer number (33354552).

Almost surely, 2^665881359 is an apocalyptic number.

665881359 is a deficient number, since it is larger than the sum of its proper divisors (401464305).

665881359 is a wasteful number, since it uses less digits than its factorization.

665881359 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36167.

The product of its digits is 1555200, while the sum is 51.

The square root of 665881359 is about 25804.6770760651. The cubic root of 665881359 is about 873.2373152438.

The spelling of 665881359 in words is "six hundred sixty-five million, eight hundred eighty-one thousand, three hundred fifty-nine".