66233812961 has 16 divisors (see below), whose sum is σ = 69521760000. Its totient is φ = 63026697600.

The previous prime is 66233812927. The next prime is 66233813017. The reversal of 66233812961 is 16921833266.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66233812961 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66233812901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2510165 + ... + 2536413.

It is an arithmetic number, because the mean of its divisors is an integer number (4345110000).

Almost surely, 2^66233812961 is an apocalyptic number.

It is an amenable number.

66233812961 is a deficient number, since it is larger than the sum of its proper divisors (3287947039).

66233812961 is a wasteful number, since it uses less digits than its factorization.

66233812961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27784.

The product of its digits is 559872, while the sum is 47.

The spelling of 66233812961 in words is "sixty-six billion, two hundred thirty-three million, eight hundred twelve thousand, nine hundred sixty-one".