66411205506 has 48 divisors (see below), whose sum is σ = 150395341824. Its totient is φ = 21962740464.

The previous prime is 66411205499. The next prime is 66411205547. The reversal of 66411205506 is 60550211466.

66411205506 is a `hidden beast` number, since 6 + 641 + 1 + 2 + 0 + 5 + 5 + 0 + 6 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 476265 + ... + 599708.

It is an arithmetic number, because the mean of its divisors is an integer number (3133236288).

Almost surely, 2^66411205506 is an apocalyptic number.

66411205506 is an abundant number, since it is smaller than the sum of its proper divisors (83984136318).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66411205506 is a wasteful number, since it uses less digits than its factorization.

66411205506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1076117 (or 1076105 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The spelling of 66411205506 in words is "sixty-six billion, four hundred eleven million, two hundred five thousand, five hundred six".