19764809423237 has 2 divisors, whose sum is σ = 19764809423238. Its totient is φ = 19764809423236.

The previous prime is 19764809423231. The next prime is 19764809423251. The reversal of 19764809423237 is 73232490846791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15603756125281 + 4161053297956 = 3950159^2 + 2039866^2 .

It is a cyclic number.

It is not a de Polignac number, because 19764809423237 - 2¹⁸ = 19764809161093 is a prime.

It is a super-2 number, since 2×19764809423237² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19764809423231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9882404711618 + 9882404711619.

It is an arithmetic number, because the mean of its divisors is an integer number (9882404711619).

Almost surely, 2^{19764809423237} is an apocalyptic number.

It is an amenable number.

19764809423237 is a deficient number, since it is larger than the sum of its proper divisors (1).

19764809423237 is an equidigital number, since it uses as much as digits as its factorization.

19764809423237 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 109734912, while the sum is 65.

The spelling of 19764809423237 in words is "nineteen trillion, seven hundred sixty-four billion, eight hundred nine million, four hundred twenty-three thousand, two hundred thirty-seven".