166255513 has 2 divisors, whose sum is σ = 166255514. Its totient is φ = 166255512.

The previous prime is 166255499. The next prime is 166255549. The reversal of 166255513 is 315552661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 151486864 + 14768649 = 12308^2 + 3843^2 .

It is an emirp because it is prime and its reverse (315552661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166255513 - 2²⁵ = 132701081 is a prime.

It is not a weakly prime, because it can be changed into another prime (166255553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83127756 + 83127757.

It is an arithmetic number, because the mean of its divisors is an integer number (83127757).

Almost surely, 2^166255513 is an apocalyptic number.

It is an amenable number.

166255513 is a deficient number, since it is larger than the sum of its proper divisors (1).

166255513 is an equidigital number, since it uses as much as digits as its factorization.

166255513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27000, while the sum is 34.

The square root of 166255513 is about 12894.0107414256. The cubic root of 166255513 is about 549.8683023518.

It can be divided in two parts, 1662 and 55513, that added together give a palindrome (57175).

The spelling of 166255513 in words is "one hundred sixty-six million, two hundred fifty-five thousand, five hundred thirteen".