1779685689461 has 2 divisors, whose sum is σ = 1779685689462. Its totient is φ = 1779685689460.

The previous prime is 1779685689451. The next prime is 1779685689499. The reversal of 1779685689461 is 1649865869771.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1029220395025 + 750465294436 = 1014505^2 + 866294^2 .

It is a cyclic number.

It is not a de Polignac number, because 1779685689461 - 2²² = 1779681495157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1779685689451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 889842844730 + 889842844731.

It is an arithmetic number, because the mean of its divisors is an integer number (889842844731).

Almost surely, 2^{1779685689461} is an apocalyptic number.

It is an amenable number.

1779685689461 is a deficient number, since it is larger than the sum of its proper divisors (1).

1779685689461 is an equidigital number, since it uses as much as digits as its factorization.

1779685689461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1097349120, while the sum is 77.

The spelling of 1779685689461 in words is "one trillion, seven hundred seventy-nine billion, six hundred eighty-five million, six hundred eighty-nine thousand, four hundred sixty-one".