818220461648 has 10 divisors (see below), whose sum is σ = 1585302144474. Its totient is φ = 409110230816.

The previous prime is 818220461621. The next prime is 818220461677. The reversal of 818220461648 is 846164022818.

It can be written as a sum of positive squares in only one way, i.e., 815719661584 + 2500800064 = 903172^2 + 50008^2 .

It is a junction number, because it is equal to n+sod(n) for n = 818220461596 and 818220461605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25569389411 + ... + 25569389442.

Almost surely, 2^818220461648 is an apocalyptic number.

It is an amenable number.

818220461648 is a deficient number, since it is larger than the sum of its proper divisors (767081682826).

818220461648 is a wasteful number, since it uses less digits than its factorization.

818220461648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51138778861 (or 51138778855 counting only the distinct ones).

The product of its (nonzero) digits is 1179648, while the sum is 50.

The spelling of 818220461648 in words is "eight hundred eighteen billion, two hundred twenty million, four hundred sixty-one thousand, six hundred forty-eight".