216430786580 has 24 divisors (see below), whose sum is σ = 481240220328. Its totient is φ = 81479825408.

The previous prime is 216430786573. The next prime is 216430786609. The reversal of 216430786580 is 85687034612.

216430786580 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 43783888516 + 172646898064 = 209246^2 + 415508^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 318280229 + ... + 318280908.

It is an arithmetic number, because the mean of its divisors is an integer number (20051675847).

Almost surely, 2^216430786580 is an apocalyptic number.

216430786580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216430786580 is an abundant number, since it is smaller than the sum of its proper divisors (264809433748).

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

216430786580 is a wasteful number, since it uses less digits than its factorization.

216430786580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636561163 (or 636561161 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 50.

The spelling of 216430786580 in words is "two hundred sixteen billion, four hundred thirty million, seven hundred eighty-six thousand, five hundred eighty".