66698746949 has 2 divisors, whose sum is σ = 66698746950. Its totient is φ = 66698746948.

The previous prime is 66698746801. The next prime is 66698746957. The reversal of 66698746949 is 94964789666.

66698746949 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60389622049 + 6309124900 = 245743^2 + 79430^2 .

It is a cyclic number.

It is not a de Polignac number, because 66698746949 - 2⁸ = 66698746693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66698746999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33349373474 + 33349373475.

It is an arithmetic number, because the mean of its divisors is an integer number (33349373475).

Almost surely, 2^66698746949 is an apocalyptic number.

It is an amenable number.

66698746949 is a deficient number, since it is larger than the sum of its proper divisors (1).

66698746949 is an equidigital number, since it uses as much as digits as its factorization.

66698746949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 846526464, while the sum is 74.

The spelling of 66698746949 in words is "sixty-six billion, six hundred ninety-eight million, seven hundred forty-six thousand, nine hundred forty-nine".