61566223 has 4 divisors (see below), whose sum is σ = 61645240. Its totient is φ = 61487208.

The previous prime is 61566209. The next prime is 61566269. The reversal of 61566223 is 32266516.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61566223 - 2⁹ = 61565711 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 (61566203) 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, 38328 + ... + 39901.

It is an arithmetic number, because the mean of its divisors is an integer number (15411310).

Almost surely, 2^61566223 is an apocalyptic number.

61566223 is a deficient number, since it is larger than the sum of its proper divisors (79017).

61566223 is an equidigital number, since it uses as much as digits as its factorization.

61566223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79016.

The product of its digits is 12960, while the sum is 31.

The square root of 61566223 is about 7846.4146589382. The cubic root of 61566223 is about 394.8639664027.

The spelling of 61566223 in words is "sixty-one million, five hundred sixty-six thousand, two hundred twenty-three".