221164161634 has 48 divisors (see below), whose sum is σ = 363733906536. Its totient is φ = 100259873280.

The previous prime is 221164161613. The next prime is 221164161719. The reversal of 221164161634 is 436161461122.

It can be written as a sum of positive squares in 12 ways, for example, as 12774650625 + 208389511009 = 113025^2 + 456497^2 .

It is a junction number, because it is equal to n+sod(n) for n = 221164161593 and 221164161602.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 99937512 + ... + 99939724.

Almost surely, 2^221164161634 is an apocalyptic number.

221164161634 is a deficient number, since it is larger than the sum of its proper divisors (142569744902).

221164161634 is a wasteful number, since it uses less digits than its factorization.

221164161634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3383 (or 3322 counting only the distinct ones).

The product of its digits is 41472, while the sum is 37.

The spelling of 221164161634 in words is "two hundred twenty-one billion, one hundred sixty-four million, one hundred sixty-one thousand, six hundred thirty-four".