66026025606561 has 16 divisors (see below), whose sum is σ = 88378033953600. Its totient is φ = 43845686878208.

The previous prime is 66026025606557. The next prime is 66026025606577. The reversal of 66026025606561 is 16560652062066.

66026025606561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 66026025606561 - 2² = 66026025606557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66026025606521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 105483805 + ... + 106107893.

It is an arithmetic number, because the mean of its divisors is an integer number (5523627122100).

Almost surely, 2^{66026025606561} is an apocalyptic number.

It is an amenable number.

66026025606561 is a deficient number, since it is larger than the sum of its proper divisors (22352008347039).

66026025606561 is a wasteful number, since it uses less digits than its factorization.

66026025606561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 761568.

The product of its (nonzero) digits is 4665600, while the sum is 51.

The spelling of 66026025606561 in words is "sixty-six trillion, twenty-six billion, twenty-five million, six hundred six thousand, five hundred sixty-one".