216534427840 has 56 divisors (see below), whose sum is σ = 515666370240. Its totient is φ = 86606419968.

The previous prime is 216534427831. The next prime is 216534427841. The reversal of 216534427840 is 48724435612.

It is not an unprimeable number, because it can be changed into a prime (216534427841) 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, 5276521 + ... + 5317399.

It is an arithmetic number, because the mean of its divisors is an integer number (9208328040).

Almost surely, 2^216534427840 is an apocalyptic number.

216534427840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216534427840 is an abundant number, since it is smaller than the sum of its proper divisors (299131942400).

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

216534427840 is a wasteful number, since it uses less digits than its factorization.

216534427840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57449 (or 57439 counting only the distinct ones).

The product of its (nonzero) digits is 1290240, while the sum is 46.

The spelling of 216534427840 in words is "two hundred sixteen billion, five hundred thirty-four million, four hundred twenty-seven thousand, eight hundred forty".