216312428835 has 96 divisors (see below), whose sum is σ = 390287020032. Its totient is φ = 110710897920.

The previous prime is 216312428833. The next prime is 216312428887. The reversal of 216312428835 is 538824213612.

216312428835 is a `hidden beast` number, since 2 + 1 + 631 + 2 + 4 + 2 + 8 + 8 + 3 + 5 = 666.

It is a Cunningham number, because it is equal to 465094²-1.

It is not a de Polignac number, because 216312428835 - 2¹ = 216312428833 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (216312428831) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 129760672 + ... + 129762338.

It is an arithmetic number, because the mean of its divisors is an integer number (4065489792).

Almost surely, 2^216312428835 is an apocalyptic number.

216312428835 is a deficient number, since it is larger than the sum of its proper divisors (173974591197).

216312428835 is a wasteful number, since it uses less digits than its factorization.

216312428835 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2433 (or 2430 counting only the distinct ones).

The product of its digits is 552960, while the sum is 45.

The spelling of 216312428835 in words is "two hundred sixteen billion, three hundred twelve million, four hundred twenty-eight thousand, eight hundred thirty-five".