66772553 has 2 divisors, whose sum is σ = 66772554. Its totient is φ = 66772552.

The previous prime is 66772501. The next prime is 66772561. The reversal of 66772553 is 35527766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58859584 + 7912969 = 7672^2 + 2813^2 .

It is a cyclic number.

It is not a de Polignac number, because 66772553 - 2²² = 62578249 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66772553.

It is not a weakly prime, because it can be changed into another prime (66772253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33386276 + 33386277.

It is an arithmetic number, because the mean of its divisors is an integer number (33386277).

Almost surely, 2^66772553 is an apocalyptic number.

It is an amenable number.

66772553 is a deficient number, since it is larger than the sum of its proper divisors (1).

66772553 is an equidigital number, since it uses as much as digits as its factorization.

66772553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 264600, while the sum is 41.

The square root of 66772553 is about 8171.4474238044. The cubic root of 66772553 is about 405.6946935058.

The spelling of 66772553 in words is "sixty-six million, seven hundred seventy-two thousand, five hundred fifty-three".