621427546772217 has 12 divisors (see below), whose sum is σ = 897853596420144. Its totient is φ = 414176094784440.

The previous prime is 621427546772117. The next prime is 621427546772267. The reversal of 621427546772217 is 712277645724126.

621427546772217 is a `hidden beast` number, since 6 + 2 + 1 + 4 + 2 + 7 + 546 + 7 + 72 + 2 + 17 = 666.

It is not a de Polignac number, because 621427546772217 - 2¹⁰ = 621427546771193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (621427546772267) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9077996959 + ... + 9078065412.

It is an arithmetic number, because the mean of its divisors is an integer number (74821133035012).

Almost surely, 2^{621427546772217} is an apocalyptic number.

It is an amenable number.

621427546772217 is a deficient number, since it is larger than the sum of its proper divisors (276426049647927).

621427546772217 is a wasteful number, since it uses less digits than its factorization.

621427546772217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18156066180 (or 18156066177 counting only the distinct ones).

The product of its digits is 110638080, while the sum is 63.

The spelling of 621427546772217 in words is "six hundred twenty-one trillion, four hundred twenty-seven billion, five hundred forty-six million, seven hundred seventy-two thousand, two hundred seventeen".