216353635240 has 32 divisors (see below), whose sum is σ = 487241969760. Its totient is φ = 86462113600.

The previous prime is 216353635153. The next prime is 216353635241. The reversal of 216353635240 is 42536353612.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 216353635193 and 216353635202.

It is not an unprimeable number, because it can be changed into a prime (216353635241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2435206 + ... + 2522485.

It is an arithmetic number, because the mean of its divisors is an integer number (15226311555).

Almost surely, 2^216353635240 is an apocalyptic number.

216353635240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216353635240 is an abundant number, since it is smaller than the sum of its proper divisors (270888334520).

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

216353635240 is a wasteful number, since it uses less digits than its factorization.

216353635240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4958793 (or 4958789 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 40.

Adding to 216353635240 its reverse (42536353612), we get a palindrome (258889988852).

The spelling of 216353635240 in words is "two hundred sixteen billion, three hundred fifty-three million, six hundred thirty-five thousand, two hundred forty".