216542130640 has 40 divisors (see below), whose sum is σ = 549229588128. Its totient is φ = 78742592640.

The previous prime is 216542130631. The next prime is 216542130671. The reversal of 216542130640 is 46031245612.

216542130640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×216542130640² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 216542130596 and 216542130605.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123034422 + ... + 123036181.

Almost surely, 2^216542130640 is an apocalyptic number.

216542130640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216542130640 is an abundant number, since it is smaller than the sum of its proper divisors (332687457488).

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

216542130640 is a wasteful number, since it uses less digits than its factorization.

216542130640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246070627 (or 246070621 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 34.

The spelling of 216542130640 in words is "two hundred sixteen billion, five hundred forty-two million, one hundred thirty thousand, six hundred forty".