16104763721 has 2 divisors, whose sum is σ = 16104763722. Its totient is φ = 16104763720.

The previous prime is 16104763699. The next prime is 16104763733. The reversal of 16104763721 is 12736740161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13656493321 + 2448270400 = 116861^2 + 49480^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16104763721 is a prime.

It is not a weakly prime, because it can be changed into another prime (16104763771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8052381860 + 8052381861.

It is an arithmetic number, because the mean of its divisors is an integer number (8052381861).

Almost surely, 2^16104763721 is an apocalyptic number.

It is an amenable number.

16104763721 is a deficient number, since it is larger than the sum of its proper divisors (1).

16104763721 is an equidigital number, since it uses as much as digits as its factorization.

16104763721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42336, while the sum is 38.

The spelling of 16104763721 in words is "sixteen billion, one hundred four million, seven hundred sixty-three thousand, seven hundred twenty-one".