213422657778 has 162 divisors, whose sum is σ = 537466062861. Its totient is φ = 61152062400.

The previous prime is 213422657741. The next prime is 213422657821. The reversal of 213422657778 is 877756224312.

It is a happy number.

213422657778 is a `hidden beast` number, since 2 + 1 + 3 + 42 + 26 + 577 + 7 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 203232360969 + 10190296809 = 450813^2 + 100947^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=326667.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 409640158 + ... + 409640678.

Almost surely, 2^213422657778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 213422657778

213422657778 is an abundant number, since it is smaller than the sum of its proper divisors (324043405083).

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

213422657778 is a wasteful number, since it uses less digits than its factorization.

213422657778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1110 (or 556 counting only the distinct ones).

The product of its digits is 7902720, while the sum is 54.

The spelling of 213422657778 in words is "two hundred thirteen billion, four hundred twenty-two million, six hundred fifty-seven thousand, seven hundred seventy-eight".