721665095 has 8 divisors (see below), whose sum is σ = 866693520. Its totient is φ = 576868480.

The previous prime is 721665083. The next prime is 721665097. The reversal of 721665095 is 590566127.

721665095 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 721665095 - 2¹⁰ = 721664071 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721665097) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51026 + ... + 63615.

It is an arithmetic number, because the mean of its divisors is an integer number (108336690).

Almost surely, 2^721665095 is an apocalyptic number.

721665095 is a deficient number, since it is larger than the sum of its proper divisors (145028425).

721665095 is a wasteful number, since it uses less digits than its factorization.

721665095 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115905.

The product of its (nonzero) digits is 113400, while the sum is 41.

The square root of 721665095 is about 26863.8250254873. The cubic root of 721665095 is about 896.9713400296.

The spelling of 721665095 in words is "seven hundred twenty-one million, six hundred sixty-five thousand, ninety-five".