206616553574427 has 20 divisors (see below), whose sum is σ = 310720892169600. Its totient is φ = 136819910188944.

The previous prime is 206616553574413. The next prime is 206616553574447. The reversal of 206616553574427 is 724475355616602.

It is a happy number.

206616553574427 is a `hidden beast` number, since 2 + 0 + 6 + 6 + 1 + 6 + 5 + 53 + 574 + 4 + 2 + 7 = 666.

It is not a de Polignac number, because 206616553574427 - 2¹¹ = 206616553572379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (206616553574447) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 8559792123 + ... + 8559816260.

It is an arithmetic number, because the mean of its divisors is an integer number (15536044608480).

Almost surely, 2^{206616553574427} is an apocalyptic number.

206616553574427 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

206616553574427 is a deficient number, since it is larger than the sum of its proper divisors (104104338595173).

206616553574427 is a wasteful number, since it uses less digits than its factorization.

206616553574427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17119608544 (or 17119608535 counting only the distinct ones).

The product of its (nonzero) digits is 254016000, while the sum is 63.

The spelling of 206616553574427 in words is "two hundred six trillion, six hundred sixteen billion, five hundred fifty-three million, five hundred seventy-four thousand, four hundred twenty-seven".