66355641 has 48 divisors (see below), whose sum is σ = 112207680. Its totient is φ = 37340160.

The previous prime is 66355633. The next prime is 66355643. The reversal of 66355641 is 14655366.

66355641 is a `hidden beast` number, since 6 + 6 + 3 + 5 + 5 + 641 = 666.

It is not a de Polignac number, because 66355641 - 2³ = 66355633 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66355596 and 66355605.

It is not an unprimeable number, because it can be changed into a prime (66355643) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 149566 + ... + 150008.

It is an arithmetic number, because the mean of its divisors is an integer number (2337660).

Almost surely, 2^66355641 is an apocalyptic number.

It is an amenable number.

66355641 is a deficient number, since it is larger than the sum of its proper divisors (45852039).

66355641 is a wasteful number, since it uses less digits than its factorization.

66355641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 566 (or 563 counting only the distinct ones).

The product of its digits is 64800, while the sum is 36.

The square root of 66355641 is about 8145.8971881555. The cubic root of 66355641 is about 404.8485762222.

The spelling of 66355641 in words is "sixty-six million, three hundred fifty-five thousand, six hundred forty-one".