216957181240 has 64 divisors (see below), whose sum is σ = 498406608000. Its totient is φ = 84971856000.

The previous prime is 216957181223. The next prime is 216957181241. The reversal of 216957181240 is 42181759612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216957181241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 409231 + ... + 775489.

It is an arithmetic number, because the mean of its divisors is an integer number (7787603250).

Almost surely, 2^216957181240 is an apocalyptic number.

216957181240 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 216957181240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (249203304000).

216957181240 is an abundant number, since it is smaller than the sum of its proper divisors (281449426760).

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

216957181240 is a wasteful number, since it uses less digits than its factorization.

216957181240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366580 (or 366576 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 46.

The spelling of 216957181240 in words is "two hundred sixteen billion, nine hundred fifty-seven million, one hundred eighty-one thousand, two hundred forty".