66750973 has 2 divisors, whose sum is σ = 66750974. Its totient is φ = 66750972.

The previous prime is 66750941. The next prime is 66751031. The reversal of 66750973 is 37905766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66145689 + 605284 = 8133^2 + 778^2 .

It is a cyclic number.

It is not a de Polignac number, because 66750973 - 2⁵ = 66750941 is a prime.

It is equal to p_3937975 and since 66750973 and 3937975 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66750913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33375486 + 33375487.

It is an arithmetic number, because the mean of its divisors is an integer number (33375487).

Almost surely, 2^66750973 is an apocalyptic number.

It is an amenable number.

66750973 is a deficient number, since it is larger than the sum of its proper divisors (1).

66750973 is an equidigital number, since it uses as much as digits as its factorization.

66750973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 238140, while the sum is 43.

The square root of 66750973 is about 8170.1268656001. The cubic root of 66750973 is about 405.6509837557.

The spelling of 66750973 in words is "sixty-six million, seven hundred fifty thousand, nine hundred seventy-three".