660641451 has 4 divisors (see below), whose sum is σ = 880855272. Its totient is φ = 440427632.

The previous prime is 660641441. The next prime is 660641453. The reversal of 660641451 is 154146066.

It is a happy number.

660641451 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 660641451 - 2¹⁰ = 660640427 is a prime.

It is not an unprimeable number, because it can be changed into a prime (660641453) 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, 110106906 + ... + 110106911.

It is an arithmetic number, because the mean of its divisors is an integer number (220213818).

Almost surely, 2^660641451 is an apocalyptic number.

660641451 is a deficient number, since it is larger than the sum of its proper divisors (220213821).

660641451 is a wasteful number, since it uses less digits than its factorization.

660641451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220213820.

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 660641451 is about 25702.9463486193. The cubic root of 660641451 is about 870.9407408881.

The spelling of 660641451 in words is "six hundred sixty million, six hundred forty-one thousand, four hundred fifty-one".