166078489 has 2 divisors, whose sum is σ = 166078490. Its totient is φ = 166078488.

The previous prime is 166078433. The next prime is 166078531. The reversal of 166078489 is 984870661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 92256025 + 73822464 = 9605^2 + 8592^2 .

It is a cyclic number.

It is not a de Polignac number, because 166078489 - 2²³ = 157689881 is a prime.

It is not a weakly prime, because it can be changed into another prime (166078889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83039244 + 83039245.

It is an arithmetic number, because the mean of its divisors is an integer number (83039245).

Almost surely, 2^166078489 is an apocalyptic number.

It is an amenable number.

166078489 is a deficient number, since it is larger than the sum of its proper divisors (1).

166078489 is an equidigital number, since it uses as much as digits as its factorization.

166078489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 580608, while the sum is 49.

The square root of 166078489 is about 12887.1443306886. The cubic root of 166078489 is about 549.6730718232.

The spelling of 166078489 in words is "one hundred sixty-six million, seventy-eight thousand, four hundred eighty-nine".