19728033601 has 2 divisors, whose sum is σ = 19728033602. Its totient is φ = 19728033600.

The previous prime is 19728033587. The next prime is 19728033613. The reversal of 19728033601 is 10633082791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12543776001 + 7184257600 = 111999^2 + 84760^2 .

It is a cyclic number.

It is not a de Polignac number, because 19728033601 - 2⁷ = 19728033473 is a prime.

It is not a weakly prime, because it can be changed into another prime (19728033631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9864016800 + 9864016801.

It is an arithmetic number, because the mean of its divisors is an integer number (9864016801).

Almost surely, 2^19728033601 is an apocalyptic number.

It is an amenable number.

19728033601 is a deficient number, since it is larger than the sum of its proper divisors (1).

19728033601 is an equidigital number, since it uses as much as digits as its factorization.

19728033601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 40.

The spelling of 19728033601 in words is "nineteen billion, seven hundred twenty-eight million, thirty-three thousand, six hundred one".