1656661223 has 8 divisors (see below), whose sum is σ = 1898406048. Its totient is φ = 1416186144.

The previous prime is 1656661189. The next prime is 1656661231. The reversal of 1656661223 is 3221666561.

It is a happy number.

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 1656661223 - 2¹⁰ = 1656660199 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1656661723) 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, 314636 + ... + 319857.

It is an arithmetic number, because the mean of its divisors is an integer number (237300756).

Almost surely, 2^1656661223 is an apocalyptic number.

1656661223 is a deficient number, since it is larger than the sum of its proper divisors (241744825).

1656661223 is an equidigital number, since it uses as much as digits as its factorization.

1656661223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 634873.

The product of its digits is 77760, while the sum is 38.

The square root of 1656661223 is about 40702.1034223048. The cubic root of 1656661223 is about 1183.2537848705.

The spelling of 1656661223 in words is "one billion, six hundred fifty-six million, six hundred sixty-one thousand, two hundred twenty-three".