166225537 has 2 divisors, whose sum is σ = 166225538. Its totient is φ = 166225536.

The previous prime is 166225519. The next prime is 166225667. The reversal of 166225537 is 735522661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 163942416 + 2283121 = 12804^2 + 1511^2 .

It is a cyclic number.

It is not a de Polignac number, because 166225537 - 2¹¹ = 166223489 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 166225496 and 166225505.

It is not a weakly prime, because it can be changed into another prime (166225237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83112768 + 83112769.

It is an arithmetic number, because the mean of its divisors is an integer number (83112769).

Almost surely, 2^166225537 is an apocalyptic number.

It is an amenable number.

166225537 is a deficient number, since it is larger than the sum of its proper divisors (1).

166225537 is an equidigital number, since it uses as much as digits as its factorization.

166225537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75600, while the sum is 37.

The square root of 166225537 is about 12892.8482888771. The cubic root of 166225537 is about 549.8352531360.

The spelling of 166225537 in words is "one hundred sixty-six million, two hundred twenty-five thousand, five hundred thirty-seven".