216706163640540 has 96 divisors (see below), whose sum is σ = 734251472123904. Its totient is φ = 46619141084160.

The previous prime is 216706163640503. The next prime is 216706163640559. The reversal of 216706163640540 is 45046361607612.

It is a super-2 number, since 2×216706163640540² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15175494516 + ... + 15175508795.

It is an arithmetic number, because the mean of its divisors is an integer number (7648452834624).

Almost surely, 2^{216706163640540} is an apocalyptic number.

216706163640540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216706163640540 is an abundant number, since it is smaller than the sum of its proper divisors (517545308483364).

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

216706163640540 is a wasteful number, since it uses less digits than its factorization.

216706163640540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30351003347 (or 30351003345 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 51.

The spelling of 216706163640540 in words is "two hundred sixteen trillion, seven hundred six billion, one hundred sixty-three million, six hundred forty thousand, five hundred forty".