66984950873 has 2 divisors, whose sum is σ = 66984950874. Its totient is φ = 66984950872.

The previous prime is 66984950869. The next prime is 66984950911. The reversal of 66984950873 is 37805948966.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66405682249 + 579268624 = 257693^2 + 24068^2 .

It is a cyclic number.

It is not a de Polignac number, because 66984950873 - 2² = 66984950869 is a prime.

It is not a weakly prime, because it can be changed into another prime (66984950863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33492475436 + 33492475437.

It is an arithmetic number, because the mean of its divisors is an integer number (33492475437).

Almost surely, 2^66984950873 is an apocalyptic number.

It is an amenable number.

66984950873 is a deficient number, since it is larger than the sum of its proper divisors (1).

66984950873 is an equidigital number, since it uses as much as digits as its factorization.

66984950873 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 78382080, while the sum is 65.

The spelling of 66984950873 in words is "sixty-six billion, nine hundred eighty-four million, nine hundred fifty thousand, eight hundred seventy-three".