166545257 has 2 divisors, whose sum is σ = 166545258. Its totient is φ = 166545256.

The previous prime is 166545229. The next prime is 166545307. The reversal of 166545257 is 752545661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 166513216 + 32041 = 12904^2 + 179^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166545257 is a prime.

It is a super-4 number, since 4×166545257⁴ (a number of 34 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (166547257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83272628 + 83272629.

It is an arithmetic number, because the mean of its divisors is an integer number (83272629).

Almost surely, 2^166545257 is an apocalyptic number.

It is an amenable number.

166545257 is a deficient number, since it is larger than the sum of its proper divisors (1).

166545257 is an equidigital number, since it uses as much as digits as its factorization.

166545257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 252000, while the sum is 41.

The square root of 166545257 is about 12905.2414545409. The cubic root of 166545257 is about 550.1875470595.

The spelling of 166545257 in words is "one hundred sixty-six million, five hundred forty-five thousand, two hundred fifty-seven".