216393694776 has 576 divisors, whose sum is σ = 751631961600. Its totient is φ = 57034720512.

The previous prime is 216393694717. The next prime is 216393694819. The reversal of 216393694776 is 677496393612.

216393694776 is a `hidden beast` number, since 2 + 16 + 3 + 93 + 69 + 477 + 6 = 666.

It is a super-2 number, since 2×216393694776² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a nude number because it is divisible by every one of its digits.

Its product of digits (61725888) is a multiple of the sum of its prime factors (972).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 245066031 + ... + 245066913.

It is an arithmetic number, because the mean of its divisors is an integer number (1304916600).

Almost surely, 2^216393694776 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216393694776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (375815980800).

216393694776 is an abundant number, since it is smaller than the sum of its proper divisors (535238266824).

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

216393694776 is an equidigital number, since it uses as much as digits as its factorization.

216393694776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 972 (or 947 counting only the distinct ones).

The product of its digits is 61725888, while the sum is 63.

The spelling of 216393694776 in words is "two hundred sixteen billion, three hundred ninety-three million, six hundred ninety-four thousand, seven hundred seventy-six".