66128141 has 4 divisors (see below), whose sum is σ = 66165792. Its totient is φ = 66090492.

The previous prime is 66128123. The next prime is 66128143. The reversal of 66128141 is 14182166.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 14182166 = 2 ⋅7091083.

It is a cyclic number.

It is not a de Polignac number, because 66128141 - 2⁶ = 66128077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66128143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16055 + ... + 19748.

It is an arithmetic number, because the mean of its divisors is an integer number (16541448).

Almost surely, 2^66128141 is an apocalyptic number.

It is an amenable number.

66128141 is a deficient number, since it is larger than the sum of its proper divisors (37651).

66128141 is a wasteful number, since it uses less digits than its factorization.

66128141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37650.

The product of its digits is 2304, while the sum is 29.

The square root of 66128141 is about 8131.9211137344. The cubic root of 66128141 is about 404.3853726476.

The spelling of 66128141 in words is "sixty-six million, one hundred twenty-eight thousand, one hundred forty-one".