217472770660 has 24 divisors (see below), whose sum is σ = 458306585856. Its totient is φ = 86681724000.

The previous prime is 217472770633. The next prime is 217472770663. The reversal of 217472770660 is 66077274712.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (217472770663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19205716 + ... + 19217035.

It is an arithmetic number, because the mean of its divisors is an integer number (19096107744).

Almost surely, 2^217472770660 is an apocalyptic number.

217472770660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

217472770660 is an abundant number, since it is smaller than the sum of its proper divisors (240833815196).

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

217472770660 is a wasteful number, since it uses less digits than its factorization.

217472770660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38423043 (or 38423041 counting only the distinct ones).

The product of its (nonzero) digits is 1382976, while the sum is 49.

The spelling of 217472770660 in words is "two hundred seventeen billion, four hundred seventy-two million, seven hundred seventy thousand, six hundred sixty".