66567625515557 has 16 divisors (see below), whose sum is σ = 67611918528000. Its totient is φ = 65528421603840.

The previous prime is 66567625515551. The next prime is 66567625515607. The reversal of 66567625515557 is 75551552676566.

It is a happy number.

66567625515557 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 66567625515557 - 2⁸ = 66567625515301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66567625515551) 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, 224859008 + ... + 225154854.

It is an arithmetic number, because the mean of its divisors is an integer number (4225744908000).

Almost surely, 2^{66567625515557} is an apocalyptic number.

It is an amenable number.

66567625515557 is a deficient number, since it is larger than the sum of its proper divisors (1044293012443).

66567625515557 is a wasteful number, since it uses less digits than its factorization.

66567625515557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304436.

The product of its digits is 1984500000, while the sum is 71.

The spelling of 66567625515557 in words is "sixty-six trillion, five hundred sixty-seven billion, six hundred twenty-five million, five hundred fifteen thousand, five hundred fifty-seven".