42166777 has 2 divisors, whose sum is σ = 42166778. Its totient is φ = 42166776.

The previous prime is 42166763. The next prime is 42166801. The reversal of 42166777 is 77766124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40717161 + 1449616 = 6381^2 + 1204^2 .

It is a cyclic number.

It is not a de Polignac number, because 42166777 - 2²³ = 33778169 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42166177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21083388 + 21083389.

It is an arithmetic number, because the mean of its divisors is an integer number (21083389).

Almost surely, 2^42166777 is an apocalyptic number.

It is an amenable number.

42166777 is a deficient number, since it is larger than the sum of its proper divisors (1).

42166777 is an equidigital number, since it uses as much as digits as its factorization.

42166777 is an evil number, because the sum of its binary digits is even.

The product of its digits is 98784, while the sum is 40.

The square root of 42166777 is about 6493.5950751491. The cubic root of 42166777 is about 348.0621530992.

The spelling of 42166777 in words is "forty-two million, one hundred sixty-six thousand, seven hundred seventy-seven".