217490306660 has 48 divisors (see below), whose sum is σ = 505687129920. Its totient is φ = 77906970240.

The previous prime is 217490306641. The next prime is 217490306681. The reversal of 217490306660 is 66603094712.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7362815 + ... + 7392294.

It is an arithmetic number, because the mean of its divisors is an integer number (10535148540).

Almost surely, 2^217490306660 is an apocalyptic number.

217490306660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

217490306660 is an abundant number, since it is smaller than the sum of its proper divisors (288196823260).

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

217490306660 is a wasteful number, since it uses less digits than its factorization.

217490306660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14755196 (or 14755194 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 44.

The spelling of 217490306660 in words is "two hundred seventeen billion, four hundred ninety million, three hundred six thousand, six hundred sixty".