66920042961 has 12 divisors (see below), whose sum is σ = 96667966980. Its totient is φ = 44610739200.

The previous prime is 66920042927. The next prime is 66920042971. The reversal of 66920042961 is 16924002966.

It can be written as a sum of positive squares in 2 ways, for example, as 53805441600 + 13114601361 = 231960^2 + 114519^2 .

It is a de Polignac number, because none of the positive numbers 2^k-66920042961 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66920042911) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50140 + ... + 369261.

It is an arithmetic number, because the mean of its divisors is an integer number (8055663915).

Almost surely, 2^66920042961 is an apocalyptic number.

It is an amenable number.

66920042961 is a deficient number, since it is larger than the sum of its proper divisors (29747924019).

66920042961 is a wasteful number, since it uses less digits than its factorization.

66920042961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437136 (or 437133 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 45.

The spelling of 66920042961 in words is "sixty-six billion, nine hundred twenty million, forty-two thousand, nine hundred sixty-one".