66404353 has 2 divisors, whose sum is σ = 66404354. Its totient is φ = 66404352.

The previous prime is 66404347. The next prime is 66404419. The reversal of 66404353 is 35340466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38229489 + 28174864 = 6183^2 + 5308^2 .

It is a cyclic number.

It is not a de Polignac number, because 66404353 - 2⁵ = 66404321 is a prime.

It is not a weakly prime, because it can be changed into another prime (66404453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33202176 + 33202177.

It is an arithmetic number, because the mean of its divisors is an integer number (33202177).

It is a Proth number, since it is equal to 4053 ⋅ 2¹⁴ + 1 and 4053 < 2¹⁴.

Almost surely, 2^66404353 is an apocalyptic number.

It is an amenable number.

66404353 is a deficient number, since it is larger than the sum of its proper divisors (1).

66404353 is an equidigital number, since it uses as much as digits as its factorization.

66404353 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 31.

The square root of 66404353 is about 8148.8866110653. The cubic root of 66404353 is about 404.9476190956.

The spelling of 66404353 in words is "sixty-six million, four hundred four thousand, three hundred fifty-three".