222197778450 has 162 divisors, whose sum is σ = 620654441589. Its totient is φ = 59180744880.

The previous prime is 222197778443. The next prime is 222197778487. The reversal of 222197778450 is 54877791222.

It can be written as a sum of positive squares in 2 ways, for example, as 217753822881 + 4443955569 = 466641^2 + 66663^2 .

It is a tau number, because it is divible by the number of its divisors (162).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=333315.

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 80 ways as a sum of consecutive naturals, for example, 269984739 + ... + 269985561.

Almost surely, 2^222197778450 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 222197778450

222197778450 is an abundant number, since it is smaller than the sum of its proper divisors (398456663139).

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

222197778450 is an frugal number, since it uses more digits than its factorization.

222197778450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1682 (or 833 counting only the distinct ones).

The product of its (nonzero) digits is 3951360, while the sum is 54.

The spelling of 222197778450 in words is "two hundred twenty-two billion, one hundred ninety-seven million, seven hundred seventy-eight thousand, four hundred fifty".