19620973841797 has 2 divisors, whose sum is σ = 19620973841798. Its totient is φ = 19620973841796.

The previous prime is 19620973841747. The next prime is 19620973841809. The reversal of 19620973841797 is 79714837902691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19265375106756 + 355598735041 = 4389234^2 + 596321^2 .

It is a cyclic number.

It is not a de Polignac number, because 19620973841797 - 2¹⁹ = 19620973317509 is a prime.

It is a super-2 number, since 2×19620973841797² (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 (19620973841717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9810486920898 + 9810486920899.

It is an arithmetic number, because the mean of its divisors is an integer number (9810486920899).

Almost surely, 2^{19620973841797} is an apocalyptic number.

It is an amenable number.

19620973841797 is a deficient number, since it is larger than the sum of its proper divisors (1).

19620973841797 is an equidigital number, since it uses as much as digits as its factorization.

19620973841797 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288054144, while the sum is 73.

The spelling of 19620973841797 in words is "nineteen trillion, six hundred twenty billion, nine hundred seventy-three million, eight hundred forty-one thousand, seven hundred ninety-seven".