66437149 has 2 divisors, whose sum is σ = 66437150. Its totient is φ = 66437148.

The previous prime is 66437117. The next prime is 66437171. The reversal of 66437149 is 94173466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55428025 + 11009124 = 7445^2 + 3318^2 .

It is a cyclic number.

It is not a de Polignac number, because 66437149 - 2⁵ = 66437117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66437549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33218574 + 33218575.

It is an arithmetic number, because the mean of its divisors is an integer number (33218575).

Almost surely, 2^66437149 is an apocalyptic number.

It is an amenable number.

66437149 is a deficient number, since it is larger than the sum of its proper divisors (1).

66437149 is an equidigital number, since it uses as much as digits as its factorization.

66437149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 40.

The square root of 66437149 is about 8150.8986621108. The cubic root of 66437149 is about 405.0142737437.

The spelling of 66437149 in words is "sixty-six million, four hundred thirty-seven thousand, one hundred forty-nine".