15778755787741 has 2 divisors, whose sum is σ = 15778755787742. Its totient is φ = 15778755787740.

The previous prime is 15778755787667. The next prime is 15778755787747. The reversal of 15778755787741 is 14778755787751.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15343116186841 + 435639600900 = 3917029^2 + 660030^2 .

It is an emirp because it is prime and its reverse (14778755787751) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15778755787741 - 2²¹ = 15778753690589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15778755787747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7889377893870 + 7889377893871.

It is an arithmetic number, because the mean of its divisors is an integer number (7889377893871).

Almost surely, 2^{15778755787741} is an apocalyptic number.

It is an amenable number.

15778755787741 is a deficient number, since it is larger than the sum of its proper divisors (1).

15778755787741 is an equidigital number, since it uses as much as digits as its factorization.

15778755787741 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3764768000, while the sum is 79.

The spelling of 15778755787741 in words is "fifteen trillion, seven hundred seventy-eight billion, seven hundred fifty-five million, seven hundred eighty-seven thousand, seven hundred forty-one".