221187648965 has 8 divisors (see below), whose sum is σ = 266273184408. Its totient is φ = 176384782080.

The previous prime is 221187648953. The next prime is 221187648989. The reversal of 221187648965 is 569846781122.

It can be written as a sum of positive squares in 4 ways, for example, as 2746388836 + 218441260129 = 52406^2 + 467377^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221187648965 - 2⁴ = 221187648949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70665416 + ... + 70668545.

It is an arithmetic number, because the mean of its divisors is an integer number (33284148051).

Almost surely, 2^221187648965 is an apocalyptic number.

It is an amenable number.

221187648965 is a deficient number, since it is larger than the sum of its proper divisors (45085535443).

221187648965 is a wasteful number, since it uses less digits than its factorization.

221187648965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141334279.

The product of its digits is 11612160, while the sum is 59.

The spelling of 221187648965 in words is "two hundred twenty-one billion, one hundred eighty-seven million, six hundred forty-eight thousand, nine hundred sixty-five".