66398053 has 2 divisors, whose sum is σ = 66398054. Its totient is φ = 66398052.

The previous prime is 66398051. The next prime is 66398071. The reversal of 66398053 is 35089366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64272289 + 2125764 = 8017^2 + 1458^2 .

It is a cyclic number.

It is not a de Polignac number, because 66398053 - 2¹ = 66398051 is a prime.

Together with 66398051, it forms a pair of twin primes.

It is the 8149-th Hogben number.

It is a junction number, because it is equal to n+sod(n) for n = 66397997 and 66398015.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66398051) by changing a digit.

It is a nontrivial repunit in base 8148.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33199026 + 33199027.

It is an arithmetic number, because the mean of its divisors is an integer number (33199027).

Almost surely, 2^66398053 is an apocalyptic number.

It is an amenable number.

66398053 is a deficient number, since it is larger than the sum of its proper divisors (1).

66398053 is an equidigital number, since it uses as much as digits as its factorization.

66398053 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 116640, while the sum is 40.

The square root of 66398053 is about 8148.5000460207. The cubic root of 66398053 is about 404.9348124518.

The spelling of 66398053 in words is "sixty-six million, three hundred ninety-eight thousand, fifty-three".