166293557 has 2 divisors, whose sum is σ = 166293558. Its totient is φ = 166293556.

The previous prime is 166293539. The next prime is 166293559. The reversal of 166293557 is 755392661.

166293557 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129254161 + 37039396 = 11369^2 + 6086^2 .

It is a cyclic number.

It is not a de Polignac number, because 166293557 - 2¹⁶ = 166228021 is a prime.

Together with 166293559, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166293559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83146778 + 83146779.

It is an arithmetic number, because the mean of its divisors is an integer number (83146779).

Almost surely, 2^166293557 is an apocalyptic number.

It is an amenable number.

166293557 is a deficient number, since it is larger than the sum of its proper divisors (1).

166293557 is an equidigital number, since it uses as much as digits as its factorization.

166293557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 340200, while the sum is 44.

The square root of 166293557 is about 12895.4859156218. The cubic root of 166293557 is about 549.9102409997.

The spelling of 166293557 in words is "one hundred sixty-six million, two hundred ninety-three thousand, five hundred fifty-seven".