216774539520 has 1152 divisors, whose sum is σ = 892841177088. Its totient is φ = 43891752960.

The previous prime is 216774539431. The next prime is 216774539521. The reversal of 216774539520 is 25935477612.

It is not an unprimeable number, because it can be changed into a prime (216774539521) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 2611741399 + ... + 2611741481.

It is an arithmetic number, because the mean of its divisors is an integer number (775035744).

Almost surely, 2^216774539520 is an apocalyptic number.

216774539520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216774539520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (446420588544).

216774539520 is an abundant number, since it is smaller than the sum of its proper divisors (676066637568).

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

216774539520 is an equidigital number, since it uses as much as digits as its factorization.

216774539520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220 (or 184 counting only the distinct ones).

The product of its (nonzero) digits is 3175200, while the sum is 51.

The spelling of 216774539520 in words is "two hundred sixteen billion, seven hundred seventy-four million, five hundred thirty-nine thousand, five hundred twenty".