660221141 has 4 divisors (see below), whose sum is σ = 688926432. Its totient is φ = 631515852.

The previous prime is 660221087. The next prime is 660221161. The reversal of 660221141 is 141122066.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 660221141 - 2⁶ = 660221077 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 28705267 = 660221141 / (6 + 6 + 0 + 2 + 2 + 1 + 1 + 4 + 1).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660221161) 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, 14352611 + ... + 14352656.

It is an arithmetic number, because the mean of its divisors is an integer number (172231608).

Almost surely, 2^660221141 is an apocalyptic number.

It is an amenable number.

660221141 is a deficient number, since it is larger than the sum of its proper divisors (28705291).

660221141 is a wasteful number, since it uses less digits than its factorization.

660221141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28705290.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 660221141 is about 25694.7687477432. The cubic root of 660221141 is about 870.7559998501.

The spelling of 660221141 in words is "six hundred sixty million, two hundred twenty-one thousand, one hundred forty-one".