56666173 has 2 divisors, whose sum is σ = 56666174. Its totient is φ = 56666172.

The previous prime is 56666149. The next prime is 56666191. The reversal of 56666173 is 37166665.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45657049 + 11009124 = 6757^2 + 3318^2 .

56666173 is a truncatable prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56666173 is a prime.

It is a super-2 number, since 2×56666173² = 6422110324931858, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56666123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28333086 + 28333087.

It is an arithmetic number, because the mean of its divisors is an integer number (28333087).

Almost surely, 2^56666173 is an apocalyptic number.

It is an amenable number.

56666173 is a deficient number, since it is larger than the sum of its proper divisors (1).

56666173 is an equidigital number, since it uses as much as digits as its factorization.

56666173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 40.

The square root of 56666173 is about 7527.6937371283. The cubic root of 56666173 is about 384.0973354420.

The spelling of 56666173 in words is "fifty-six million, six hundred sixty-six thousand, one hundred seventy-three".