217649061020 has 12 divisors (see below), whose sum is σ = 457063028184. Its totient is φ = 87059624400.

The previous prime is 217649061013. The next prime is 217649061101. The reversal of 217649061020 is 20160946712.

217649061020 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×217649061020² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5441226506 + ... + 5441226545.

It is an arithmetic number, because the mean of its divisors is an integer number (38088585682).

Almost surely, 2^217649061020 is an apocalyptic number.

217649061020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

217649061020 is an abundant number, since it is smaller than the sum of its proper divisors (239413967164).

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

217649061020 is a wasteful number, since it uses less digits than its factorization.

217649061020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10882453060 (or 10882453058 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 38.

The spelling of 217649061020 in words is "two hundred seventeen billion, six hundred forty-nine million, sixty-one thousand, twenty".