19651008080213 has 2 divisors, whose sum is σ = 19651008080214. Its totient is φ = 19651008080212.

The previous prime is 19651008080183. The next prime is 19651008080299. The reversal of 19651008080213 is 31208080015691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16019670041764 + 3631338038449 = 4002458^2 + 1905607^2 .

It is a cyclic number.

It is not a de Polignac number, because 19651008080213 - 2²⁴ = 19650991302997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19651008080513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9825504040106 + 9825504040107.

It is an arithmetic number, because the mean of its divisors is an integer number (9825504040107).

Almost surely, 2^{19651008080213} is an apocalyptic number.

It is an amenable number.

19651008080213 is a deficient number, since it is larger than the sum of its proper divisors (1).

19651008080213 is an equidigital number, since it uses as much as digits as its factorization.

19651008080213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 44.

The spelling of 19651008080213 in words is "nineteen trillion, six hundred fifty-one billion, eight million, eighty thousand, two hundred thirteen".