20146566666247 has 32 divisors (see below), whose sum is σ = 24753262510080. Its totient is φ = 16010815453920.

The previous prime is 20146566666221. The next prime is 20146566666253. The reversal of 20146566666247 is 74266666564102.

It is a happy number.

It is not a de Polignac number, because 20146566666247 - 2²³ = 20146558277639 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 (20146566666277) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 169286358 + ... + 169405324.

It is an arithmetic number, because the mean of its divisors is an integer number (773539453440).

Almost surely, 2^{20146566666247} is an apocalyptic number.

20146566666247 is a deficient number, since it is larger than the sum of its proper divisors (4606695843833).

20146566666247 is a wasteful number, since it uses less digits than its factorization.

20146566666247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146131.

The product of its (nonzero) digits is 104509440, while the sum is 61.

The spelling of 20146566666247 in words is "twenty trillion, one hundred forty-six billion, five hundred sixty-six million, six hundred sixty-six thousand, two hundred forty-seven".