661055223 has 8 divisors (see below), whose sum is σ = 893481328. Its totient is φ = 434666304.

The previous prime is 661055221. The next prime is 661055279. The reversal of 661055223 is 322550166.

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

It is not a de Polignac number, because 661055223 - 2¹ = 661055221 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 (661055221) 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, 1509040 + ... + 1509477.

It is an arithmetic number, because the mean of its divisors is an integer number (111685166).

Almost surely, 2^661055223 is an apocalyptic number.

661055223 is a deficient number, since it is larger than the sum of its proper divisors (232426105).

661055223 is a wasteful number, since it uses less digits than its factorization.

661055223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3018593.

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 661055223 is about 25710.9942048144. The cubic root of 661055223 is about 871.1225317230.

The spelling of 661055223 in words is "six hundred sixty-one million, fifty-five thousand, two hundred twenty-three".