66573953 has 2 divisors, whose sum is σ = 66573954. Its totient is φ = 66573952.

The previous prime is 66573943. The next prime is 66573959. The reversal of 66573953 is 35937566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64770304 + 1803649 = 8048^2 + 1343^2 .

It is a cyclic number.

It is not a de Polignac number, because 66573953 - 2¹² = 66569857 is a prime.

It is not a weakly prime, because it can be changed into another prime (66573959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33286976 + 33286977.

It is an arithmetic number, because the mean of its divisors is an integer number (33286977).

Almost surely, 2^66573953 is an apocalyptic number.

It is an amenable number.

66573953 is a deficient number, since it is larger than the sum of its proper divisors (1).

66573953 is an equidigital number, since it uses as much as digits as its factorization.

66573953 is an evil number, because the sum of its binary digits is even.

The product of its digits is 510300, while the sum is 44.

The square root of 66573953 is about 8159.2863045735. The cubic root of 66573953 is about 405.2920780855.

The spelling of 66573953 in words is "sixty-six million, five hundred seventy-three thousand, nine hundred fifty-three".