66155057 has 2 divisors, whose sum is σ = 66155058. Its totient is φ = 66155056.

The previous prime is 66155051. The next prime is 66155069. The reversal of 66155057 is 75055166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41165056 + 24990001 = 6416^2 + 4999^2 .

It is a cyclic number.

It is not a de Polignac number, because 66155057 - 2⁶ = 66154993 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66155051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33077528 + 33077529.

It is an arithmetic number, because the mean of its divisors is an integer number (33077529).

Almost surely, 2^66155057 is an apocalyptic number.

It is an amenable number.

66155057 is a deficient number, since it is larger than the sum of its proper divisors (1).

66155057 is an equidigital number, since it uses as much as digits as its factorization.

66155057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31500, while the sum is 35.

The square root of 66155057 is about 8133.5759048527. The cubic root of 66155057 is about 404.4402305850.

The spelling of 66155057 in words is "sixty-six million, one hundred fifty-five thousand, fifty-seven".