665456153 has 4 divisors (see below), whose sum is σ = 665653428. Its totient is φ = 665258880.

The previous prime is 665456147. The next prime is 665456161. The reversal of 665456153 is 351654566.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 265136089 + 400320064 = 16283^2 + 20008^2 .

It is a cyclic number.

It is not a de Polignac number, because 665456153 - 2⁸ = 665455897 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 665456153.

It is not an unprimeable number, because it can be changed into a prime (665456053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93488 + ... + 100353.

It is an arithmetic number, because the mean of its divisors is an integer number (166413357).

Almost surely, 2^665456153 is an apocalyptic number.

It is an amenable number.

665456153 is a deficient number, since it is larger than the sum of its proper divisors (197275).

665456153 is a wasteful number, since it uses less digits than its factorization.

665456153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197274.

The product of its digits is 324000, while the sum is 41.

The square root of 665456153 is about 25796.4368275931. The cubic root of 665456153 is about 873.0514038435.

The spelling of 665456153 in words is "six hundred sixty-five million, four hundred fifty-six thousand, one hundred fifty-three".