221645266362 has 192 divisors, whose sum is σ = 541826288640. Its totient is φ = 65019801600.

The previous prime is 221645266313. The next prime is 221645266379. The reversal of 221645266362 is 263662546122.

221645266362 is a `hidden beast` number, since 2 + 2 + 1 + 6 + 4 + 5 + 2 + 6 + 636 + 2 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 189278037 + ... + 189279207.

It is an arithmetic number, because the mean of its divisors is an integer number (2822011920).

Almost surely, 2^221645266362 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221645266362, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (270913144320).

221645266362 is an abundant number, since it is smaller than the sum of its proper divisors (320181022278).

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

221645266362 is a wasteful number, since it uses less digits than its factorization.

221645266362 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1589 (or 1586 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 45.

The spelling of 221645266362 in words is "two hundred twenty-one billion, six hundred forty-five million, two hundred sixty-six thousand, three hundred sixty-two".