660919453 has 4 divisors (see below), whose sum is σ = 661038300. Its totient is φ = 660800608.

The previous prime is 660919439. The next prime is 660919471. The reversal of 660919453 is 354919066.

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 323352324 + 337567129 = 17982^2 + 18373^2 .

It is a cyclic number.

It is not a de Polignac number, because 660919453 - 2⁹ = 660918941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660919403) 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, 50650 + ... + 62347.

It is an arithmetic number, because the mean of its divisors is an integer number (165259575).

Almost surely, 2^660919453 is an apocalyptic number.

It is an amenable number.

660919453 is a deficient number, since it is larger than the sum of its proper divisors (118847).

660919453 is a wasteful number, since it uses less digits than its factorization.

660919453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118846.

The product of its (nonzero) digits is 174960, while the sum is 43.

The square root of 660919453 is about 25708.3537590410. The cubic root of 660919453 is about 871.0628895025.

It can be divided in two parts, 6609 and 19453, that added together give a palindrome (26062).

The spelling of 660919453 in words is "six hundred sixty million, nine hundred nineteen thousand, four hundred fifty-three".