66128837 has 2 divisors, whose sum is σ = 66128838. Its totient is φ = 66128836.

The previous prime is 66128807. The next prime is 66128849. The reversal of 66128837 is 73882166.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63218401 + 2910436 = 7951^2 + 1706^2 .

It is a cyclic number.

It is not a de Polignac number, because 66128837 - 2⁸ = 66128581 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66128794 and 66128803.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66128807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33064418 + 33064419.

It is an arithmetic number, because the mean of its divisors is an integer number (33064419).

Almost surely, 2^66128837 is an apocalyptic number.

It is an amenable number.

66128837 is a deficient number, since it is larger than the sum of its proper divisors (1).

66128837 is an equidigital number, since it uses as much as digits as its factorization.

66128837 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 41.

The square root of 66128837 is about 8131.9639079376. The cubic root of 66128837 is about 404.3867913639.

The spelling of 66128837 in words is "sixty-six million, one hundred twenty-eight thousand, eight hundred thirty-seven".