66955239547 has 16 divisors (see below), whose sum is σ = 79161628672. Its totient is φ = 55417296960.

The previous prime is 66955239541. The next prime is 66955239557. The reversal of 66955239547 is 74593255966.

It is a cyclic number.

It is not a de Polignac number, because 66955239547 - 2¹¹ = 66955237499 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66955239541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 238413 + ... + 436750.

It is an arithmetic number, because the mean of its divisors is an integer number (4947601792).

Almost surely, 2^66955239547 is an apocalyptic number.

66955239547 is a deficient number, since it is larger than the sum of its proper divisors (12206389125).

66955239547 is a wasteful number, since it uses less digits than its factorization.

66955239547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 675658.

The product of its digits is 61236000, while the sum is 61.

The spelling of 66955239547 in words is "sixty-six billion, nine hundred fifty-five million, two hundred thirty-nine thousand, five hundred forty-seven".