661005227 has 8 divisors (see below), whose sum is σ = 678107136. Its totient is φ = 644029992.

The previous prime is 661005221. The next prime is 661005251. The reversal of 661005227 is 722500166.

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

It is a cyclic number.

It is not a de Polignac number, because 661005227 - 2²⁰ = 659956651 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 661005227.

It is not an unprimeable number, because it can be changed into a prime (661005221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21053 + ... + 42014.

It is an arithmetic number, because the mean of its divisors is an integer number (84763392).

Almost surely, 2^661005227 is an apocalyptic number.

661005227 is a deficient number, since it is larger than the sum of its proper divisors (17101909).

661005227 is a wasteful number, since it uses less digits than its factorization.

661005227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63337.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 661005227 is about 25710.0219175325. The cubic root of 661005227 is about 871.1005699974.

The spelling of 661005227 in words is "six hundred sixty-one million, five thousand, two hundred twenty-seven".