66898968937 has 2 divisors, whose sum is σ = 66898968938. Its totient is φ = 66898968936.

The previous prime is 66898968907. The next prime is 66898968979. The reversal of 66898968937 is 73986989866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63856784601 + 3042184336 = 252699^2 + 55156^2 .

It is a cyclic number.

It is not a de Polignac number, because 66898968937 - 2³¹ = 64751485289 is a prime.

It is not a weakly prime, because it can be changed into another prime (66898968907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33449484468 + 33449484469.

It is an arithmetic number, because the mean of its divisors is an integer number (33449484469).

Almost surely, 2^66898968937 is an apocalyptic number.

It is an amenable number.

66898968937 is a deficient number, since it is larger than the sum of its proper divisors (1).

66898968937 is an equidigital number, since it uses as much as digits as its factorization.

66898968937 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1693052928, while the sum is 79.

The spelling of 66898968937 in words is "sixty-six billion, eight hundred ninety-eight million, nine hundred sixty-eight thousand, nine hundred thirty-seven".