20178396403369 has 2 divisors, whose sum is σ = 20178396403370. Its totient is φ = 20178396403368.

The previous prime is 20178396403339. The next prime is 20178396403379. The reversal of 20178396403369 is 96330469387102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16602666681769 + 3575729721600 = 4074637^2 + 1890960^2 .

It is a cyclic number.

It is not a de Polignac number, because 20178396403369 - 2¹¹ = 20178396401321 is a prime.

It is a super-2 number, since 2×20178396403369² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20178396403339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10089198201684 + 10089198201685.

It is an arithmetic number, because the mean of its divisors is an integer number (10089198201685).

Almost surely, 2^{20178396403369} is an apocalyptic number.

It is an amenable number.

20178396403369 is a deficient number, since it is larger than the sum of its proper divisors (1).

20178396403369 is an equidigital number, since it uses as much as digits as its factorization.

20178396403369 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 35271936, while the sum is 61.

The spelling of 20178396403369 in words is "twenty trillion, one hundred seventy-eight billion, three hundred ninety-six million, four hundred three thousand, three hundred sixty-nine".