641221613216 has 24 divisors (see below), whose sum is σ = 1264623724980. Its totient is φ = 320047333888.

The previous prime is 641221613141. The next prime is 641221613233. The reversal of 641221613216 is 612316122146.

It can be written as a sum of positive squares in 2 ways, for example, as 631065004816 + 10156608400 = 794396^2 + 100780^2 .

It is a super-2 number, since 2×641221613216² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17590031 + ... + 17626446.

Almost surely, 2^641221613216 is an apocalyptic number.

It is an amenable number.

641221613216 is a deficient number, since it is larger than the sum of its proper divisors (623402111764).

641221613216 is a wasteful number, since it uses less digits than its factorization.

641221613216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35217056 (or 35217048 counting only the distinct ones).

The product of its digits is 20736, while the sum is 35.

The spelling of 641221613216 in words is "six hundred forty-one billion, two hundred twenty-one million, six hundred thirteen thousand, two hundred sixteen".