216424553133640 has 32 divisors (see below), whose sum is σ = 486978602715000. Its totient is φ = 86565668690944.

The previous prime is 216424553133601. The next prime is 216424553133647. The reversal of 216424553133640 is 46331355424612.

It can be written as a sum of positive squares in 4 ways, for example, as 212722400020036 + 3702153113604 = 14585006^2 + 1924098^2 .

It is not an unprimeable number, because it can be changed into a prime (216424553133647) 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, 128923195 + ... + 130591114.

Almost surely, 2^{216424553133640} is an apocalyptic number.

216424553133640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216424553133640 is an abundant number, since it is smaller than the sum of its proper divisors (270554049581360).

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

216424553133640 is a wasteful number, since it uses less digits than its factorization.

216424553133640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259535169 (or 259535165 counting only the distinct ones).

The product of its (nonzero) digits is 6220800, while the sum is 49.

The spelling of 216424553133640 in words is "two hundred sixteen trillion, four hundred twenty-four billion, five hundred fifty-three million, one hundred thirty-three thousand, six hundred forty".