66919033811 has 16 divisors (see below), whose sum is σ = 76781040384. Its totient is φ = 57132735264.

The previous prime is 66919033793. The next prime is 66919033823. The reversal of 66919033811 is 11833091966.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 66919033811 - 2¹⁴ = 66919017427 is a prime.

It is a super-2 number, since 2×66919033811² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66919033211) 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, 6101945 + ... + 6112901.

It is an arithmetic number, because the mean of its divisors is an integer number (4798815024).

Almost surely, 2^66919033811 is an apocalyptic number.

66919033811 is a deficient number, since it is larger than the sum of its proper divisors (9862006573).

66919033811 is a wasteful number, since it uses less digits than its factorization.

66919033811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14330.

The product of its (nonzero) digits is 209952, while the sum is 47.

The spelling of 66919033811 in words is "sixty-six billion, nine hundred nineteen million, thirty-three thousand, eight hundred eleven".