216401550340 has 24 divisors (see below), whose sum is σ = 454787847360. Its totient is φ = 86494983648.

The previous prime is 216401550331. The next prime is 216401550341. The reversal of 216401550340 is 43055104612.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (216401550341) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4075242 + ... + 4128001.

It is an arithmetic number, because the mean of its divisors is an integer number (18949493640).

Almost surely, 2^216401550340 is an apocalyptic number.

216401550340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216401550340 is an abundant number, since it is smaller than the sum of its proper divisors (238386297020).

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

216401550340 is a wasteful number, since it uses less digits than its factorization.

216401550340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8204571 (or 8204569 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 31.

Adding to 216401550340 its reverse (43055104612), we get a palindrome (259456654952).

The spelling of 216401550340 in words is "two hundred sixteen billion, four hundred one million, five hundred fifty thousand, three hundred forty".