816663744740 has 24 divisors (see below), whose sum is σ = 1719402604920. Its totient is φ = 325825737728.

The previous prime is 816663744629. The next prime is 816663744791. The reversal of 816663744740 is 47447366618.

It can be written as a sum of positive squares in 4 ways, for example, as 10356725824 + 806307018916 = 101768^2 + 897946^2 .

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, 52477037 + ... + 52492596.

It is an arithmetic number, because the mean of its divisors is an integer number (71641775205).

Almost surely, 2^816663744740 is an apocalyptic number.

It is an amenable number.

816663744740 is an abundant number, since it is smaller than the sum of its proper divisors (902738860180).

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

816663744740 is a wasteful number, since it uses less digits than its factorization.

816663744740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104970031 (or 104970029 counting only the distinct ones).

The product of its (nonzero) digits is 16257024, while the sum is 56.

The spelling of 816663744740 in words is "eight hundred sixteen billion, six hundred sixty-three million, seven hundred forty-four thousand, seven hundred forty".