660064453 has 4 divisors (see below), whose sum is σ = 676163628. Its totient is φ = 643965280.

The previous prime is 660064421. The next prime is 660064459. The reversal of 660064453 is 354460066.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 354460066 = 2 ⋅177230033.

It can be written as a sum of positive squares in 2 ways, for example, as 13786369 + 646278084 = 3713^2 + 25422^2 .

It is a cyclic number.

It is not a de Polignac number, because 660064453 - 2⁵ = 660064421 is a prime.

It is a super-2 number, since 2×660064453² = 871370164228378418, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660064459) 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, 8049526 + ... + 8049607.

It is an arithmetic number, because the mean of its divisors is an integer number (169040907).

Almost surely, 2^660064453 is an apocalyptic number.

It is an amenable number.

660064453 is a deficient number, since it is larger than the sum of its proper divisors (16099175).

660064453 is a wasteful number, since it uses less digits than its factorization.

660064453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16099174.

The product of its (nonzero) digits is 51840, while the sum is 34.

The square root of 660064453 is about 25691.7195415177. The cubic root of 660064453 is about 870.6871098967.

The spelling of 660064453 in words is "six hundred sixty million, sixty-four thousand, four hundred fifty-three".