66627553 has 2 divisors, whose sum is σ = 66627554. Its totient is φ = 66627552.

The previous prime is 66627551. The next prime is 66627557. The reversal of 66627553 is 35572666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61277584 + 5349969 = 7828^2 + 2313^2 .

It is a cyclic number.

It is not a de Polignac number, because 66627553 - 2¹ = 66627551 is a prime.

Together with 66627551, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (66627551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33313776 + 33313777.

It is an arithmetic number, because the mean of its divisors is an integer number (33313777).

Almost surely, 2^66627553 is an apocalyptic number.

It is an amenable number.

66627553 is a deficient number, since it is larger than the sum of its proper divisors (1).

66627553 is an equidigital number, since it uses as much as digits as its factorization.

66627553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 226800, while the sum is 40.

The square root of 66627553 is about 8162.5702447207. The cubic root of 66627553 is about 405.4008184510.

The spelling of 66627553 in words is "sixty-six million, six hundred twenty-seven thousand, five hundred fifty-three".