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166188989 is a prime number
BaseRepresentation
bin10011110011111…
…01011110111101
3102120201021102202
421321331132331
5320021021424
624254001245
74055404001
oct1171753675
9376637382
10166188989
118589a27a
12477a6225
13285797a5
1418100701
15e8cb2ae
hex9e7d7bd

166188989 has 2 divisors, whose sum is σ = 166188990. Its totient is φ = 166188988.

The previous prime is 166188983. The next prime is 166189013. The reversal of 166188989 is 989881661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86676100 + 79512889 = 9310^2 + 8917^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-166188989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166188983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83094494 + 83094495.

It is an arithmetic number, because the mean of its divisors is an integer number (83094495).

Almost surely, 2166188989 is an apocalyptic number.

It is an amenable number.

166188989 is a deficient number, since it is larger than the sum of its proper divisors (1).

166188989 is an equidigital number, since it uses as much as digits as its factorization.

166188989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1492992, while the sum is 56.

The square root of 166188989 is about 12891.4308360244. The cubic root of 166188989 is about 549.7949527663.

The spelling of 166188989 in words is "one hundred sixty-six million, one hundred eighty-eight thousand, nine hundred eighty-nine".