66157571601061 has 2 divisors, whose sum is σ = 66157571601062. Its totient is φ = 66157571601060.

The previous prime is 66157571601059. The next prime is 66157571601083. The reversal of 66157571601061 is 16010617575166.

66157571601061 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., 65364492298561 + 793079302500 = 8084831^2 + 890550^2 .

It is a cyclic number.

It is not a de Polignac number, because 66157571601061 - 2¹ = 66157571601059 is a prime.

Together with 66157571601059, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66157571601001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33078785800530 + 33078785800531.

It is an arithmetic number, because the mean of its divisors is an integer number (33078785800531).

Almost surely, 2^{66157571601061} is an apocalyptic number.

It is an amenable number.

66157571601061 is a deficient number, since it is larger than the sum of its proper divisors (1).

66157571601061 is an equidigital number, since it uses as much as digits as its factorization.

66157571601061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1587600, while the sum is 52.

The spelling of 66157571601061 in words is "sixty-six trillion, one hundred fifty-seven billion, five hundred seventy-one million, six hundred one thousand, sixty-one".