66661793061 has 8 divisors (see below), whose sum is σ = 89025983520. Its totient is φ = 44369398992.

The previous prime is 66661793027. The next prime is 66661793063. The reversal of 66661793061 is 16039716666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66661793061 - 2¹³ = 66661784869 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66661792995 and 66661793013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66661793063) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 17946930 + ... + 17950643.

It is an arithmetic number, because the mean of its divisors is an integer number (11128247940).

Almost surely, 2^66661793061 is an apocalyptic number.

It is an amenable number.

66661793061 is a deficient number, since it is larger than the sum of its proper divisors (22364190459).

66661793061 is a wasteful number, since it uses less digits than its factorization.

66661793061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35898195.

The product of its (nonzero) digits is 1469664, while the sum is 51.

The spelling of 66661793061 in words is "sixty-six billion, six hundred sixty-one million, seven hundred ninety-three thousand, sixty-one".