660221745 has 8 divisors (see below), whose sum is σ = 1056354816. Its totient is φ = 352118256.

The previous prime is 660221629. The next prime is 660221761. The reversal of 660221745 is 547122066.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 660221745 - 2⁸ = 660221489 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22007377 + ... + 22007406.

It is an arithmetic number, because the mean of its divisors is an integer number (132044352).

Almost surely, 2^660221745 is an apocalyptic number.

It is an amenable number.

660221745 is a deficient number, since it is larger than the sum of its proper divisors (396133071).

660221745 is a wasteful number, since it uses less digits than its factorization.

660221745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44014791.

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 660221745 is about 25694.7805011057. The cubic root of 660221745 is about 870.7562653856.

The spelling of 660221745 in words is "six hundred sixty million, two hundred twenty-one thousand, seven hundred forty-five".