66559444495566 has 32 divisors (see below), whose sum is σ = 145246223606400. Its totient is φ = 20165970658080.

The previous prime is 66559444495561. The next prime is 66559444495571.

66559444495566 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (66559444495561) and next prime (66559444495571).

It is a junction number, because it is equal to n+sod(n) for n = 66559444495491 and 66559444495500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66559444495561) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 88572436 + ... + 89320743.

It is an arithmetic number, because the mean of its divisors is an integer number (4538944487700).

Almost surely, 2^{66559444495566} is an apocalyptic number.

66559444495566 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

66559444495566 is an abundant number, since it is smaller than the sum of its proper divisors (78686779110834).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66559444495566 is a wasteful number, since it uses less digits than its factorization.

66559444495566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177898864.

The product of its digits is 16796160000, while the sum is 78.

The spelling of 66559444495566 in words is "sixty-six trillion, five hundred fifty-nine billion, four hundred forty-four million, four hundred ninety-five thousand, five hundred sixty-six".