216262283778 has 126 divisors (see below), whose sum is σ = 514115272377. Its totient is φ = 68186810880.

The previous prime is 216262283767. The next prime is 216262283807. The reversal of 216262283778 is 877382262612.

216262283778 is a `hidden beast` number, since 2 + 1 + 6 + 2 + 622 + 8 + 3 + 7 + 7 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 172239110289 + 44023173489 = 415017^2 + 209817^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=328833.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 62 ways as a sum of consecutive naturals, for example, 337382338 + ... + 337382978.

Almost surely, 2^216262283778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216262283778

216262283778 is an abundant number, since it is smaller than the sum of its proper divisors (297852988599).

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

216262283778 is an frugal number, since it uses more digits than its factorization.

216262283778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1340 (or 665 counting only the distinct ones).

The product of its digits is 5419008, while the sum is 54.

The spelling of 216262283778 in words is "two hundred sixteen billion, two hundred sixty-two million, two hundred eighty-three thousand, seven hundred seventy-eight".