66000553 has 2 divisors, whose sum is σ = 66000554. Its totient is φ = 66000552.

The previous prime is 66000523. The next prime is 66000569. The reversal of 66000553 is 35500066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65983129 + 17424 = 8123^2 + 132^2 .

It is a cyclic number.

It is not a de Polignac number, because 66000553 - 2¹⁷ = 65869481 is a prime.

It is a super-3 number, since 3×66000553³ (a number of 24 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (66000523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33000276 + 33000277.

It is an arithmetic number, because the mean of its divisors is an integer number (33000277).

Almost surely, 2^66000553 is an apocalyptic number.

It is an amenable number.

66000553 is a deficient number, since it is larger than the sum of its proper divisors (1).

66000553 is an equidigital number, since it uses as much as digits as its factorization.

66000553 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2700, while the sum is 25.

The square root of 66000553 is about 8124.0724393619. The cubic root of 66000553 is about 404.1251307488.

The spelling of 66000553 in words is "sixty-six million, five hundred fifty-three", and thus it is an aban number.