56666149 has 2 divisors, whose sum is σ = 56666150. Its totient is φ = 56666148.

The previous prime is 56666123. The next prime is 56666173. The reversal of 56666149 is 94166665.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51581124 + 5085025 = 7182^2 + 2255^2 .

It is a cyclic number.

It is not a de Polignac number, because 56666149 - 2¹⁹ = 56141861 is a prime.

It is a super-2 number, since 2×56666149² = 6422104884980402, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56666119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28333074 + 28333075.

It is an arithmetic number, because the mean of its divisors is an integer number (28333075).

Almost surely, 2^56666149 is an apocalyptic number.

It is an amenable number.

56666149 is a deficient number, since it is larger than the sum of its proper divisors (1).

56666149 is an equidigital number, since it uses as much as digits as its factorization.

56666149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 233280, while the sum is 43.

The square root of 56666149 is about 7527.6921430144. The cubic root of 56666149 is about 384.0972812160.

The spelling of 56666149 in words is "fifty-six million, six hundred sixty-six thousand, one hundred forty-nine".