66126700553 has 2 divisors, whose sum is σ = 66126700554. Its totient is φ = 66126700552.

The previous prime is 66126700489. The next prime is 66126700561. The reversal of 66126700553 is 35500762166.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45449123344 + 20677577209 = 213188^2 + 143797^2 .

It is a cyclic number.

It is not a de Polignac number, because 66126700553 - 2⁶ = 66126700489 is a prime.

It is a super-2 number, since 2×66126700553² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66126700553.

It is not a weakly prime, because it can be changed into another prime (66126700753) 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, 33063350276 + 33063350277.

It is an arithmetic number, because the mean of its divisors is an integer number (33063350277).

Almost surely, 2^66126700553 is an apocalyptic number.

It is an amenable number.

66126700553 is a deficient number, since it is larger than the sum of its proper divisors (1).

66126700553 is an equidigital number, since it uses as much as digits as its factorization.

66126700553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 226800, while the sum is 41.

The spelling of 66126700553 in words is "sixty-six billion, one hundred twenty-six million, seven hundred thousand, five hundred fifty-three".