216234644540 has 24 divisors (see below), whose sum is σ = 454757632560. Its totient is φ = 86367214208.

The previous prime is 216234644533. The next prime is 216234644567. The reversal of 216234644540 is 45446432612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7901225 + ... + 7928544.

It is an arithmetic number, because the mean of its divisors is an integer number (18948234690).

Almost surely, 2^216234644540 is an apocalyptic number.

216234644540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216234644540 is an abundant number, since it is smaller than the sum of its proper divisors (238522988020).

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

216234644540 is a wasteful number, since it uses less digits than its factorization.

216234644540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15830461 (or 15830459 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 41.

The spelling of 216234644540 in words is "two hundred sixteen billion, two hundred thirty-four million, six hundred forty-four thousand, five hundred forty".