66157057 has 2 divisors, whose sum is σ = 66157058. Its totient is φ = 66157056.

The previous prime is 66157051. The next prime is 66157079. The reversal of 66157057 is 75075166.

66157057 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59582961 + 6574096 = 7719^2 + 2564^2 .

It is a cyclic number.

It is not a de Polignac number, because 66157057 - 2⁷ = 66156929 is a prime.

It is not a weakly prime, because it can be changed into another prime (66157051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33078528 + 33078529.

It is an arithmetic number, because the mean of its divisors is an integer number (33078529).

Almost surely, 2^66157057 is an apocalyptic number.

It is an amenable number.

66157057 is a deficient number, since it is larger than the sum of its proper divisors (1).

66157057 is an equidigital number, since it uses as much as digits as its factorization.

66157057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 44100, while the sum is 37.

The square root of 66157057 is about 8133.6988510763. The cubic root of 66157057 is about 404.4443062236. Note that the first 3 decimals are identical.

The spelling of 66157057 in words is "sixty-six million, one hundred fifty-seven thousand, fifty-seven".