66128614405 has 16 divisors (see below), whose sum is σ = 91146412800. Its totient is φ = 45117464832.

The previous prime is 66128614397. The next prime is 66128614411. The reversal of 66128614405 is 50441682166.

It is a cyclic number.

It is not a de Polignac number, because 66128614405 - 2³ = 66128614397 is a prime.

It is a super-3 number, since 3×66128614405³ (a number of 33 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4740244 + ... + 4754173.

It is an arithmetic number, because the mean of its divisors is an integer number (5696650800).

Almost surely, 2^66128614405 is an apocalyptic number.

It is an amenable number.

66128614405 is a deficient number, since it is larger than the sum of its proper divisors (25017798395).

66128614405 is a wasteful number, since it uses less digits than its factorization.

66128614405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9494628.

The product of its (nonzero) digits is 276480, while the sum is 43.

The spelling of 66128614405 in words is "sixty-six billion, one hundred twenty-eight million, six hundred fourteen thousand, four hundred five".