216612375540 has 96 divisors (see below), whose sum is σ = 684468005760. Its totient is φ = 50701324800.

The previous prime is 216612375491. The next prime is 216612375587. The reversal of 216612375540 is 45573216612.

It is a junction number, because it is equal to n+sod(n) for n = 216612375492 and 216612375501.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5639491 + ... + 5677770.

It is an arithmetic number, because the mean of its divisors is an integer number (7129875060).

Almost surely, 2^216612375540 is an apocalyptic number.

216612375540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216612375540 is an abundant number, since it is smaller than the sum of its proper divisors (467855630220).

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

216612375540 is a wasteful number, since it uses less digits than its factorization.

216612375540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11317313 (or 11317311 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 42.

The spelling of 216612375540 in words is "two hundred sixteen billion, six hundred twelve million, three hundred seventy-five thousand, five hundred forty".