216064904640 has 168 divisors, whose sum is σ = 742835535408. Its totient is φ = 53185167360.

The previous prime is 216064904633. The next prime is 216064904677. The reversal of 216064904640 is 46409460612.

It is a junction number, because it is equal to n+sod(n) for n = 216064904592 and 216064904601.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 503641 + ... + 828120.

Almost surely, 2^216064904640 is an apocalyptic number.

216064904640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216064904640 is an abundant number, since it is smaller than the sum of its proper divisors (526770630768).

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

216064904640 is a wasteful number, since it uses less digits than its factorization.

216064904640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1331807 (or 1331784 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 42.

The spelling of 216064904640 in words is "two hundred sixteen billion, sixty-four million, nine hundred four thousand, six hundred forty".