78881443212101 has 2 divisors, whose sum is σ = 78881443212102. Its totient is φ = 78881443212100.

The previous prime is 78881443212053. The next prime is 78881443212251. The reversal of 78881443212101 is 10121234418887.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42122371530625 + 36759071681476 = 6490175^2 + 6062926^2 .

It is a cyclic number.

It is not a de Polignac number, because 78881443212101 - 2²⁶ = 78881376103237 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78881443212101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78881443215101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39440721606050 + 39440721606051.

It is an arithmetic number, because the mean of its divisors is an integer number (39440721606051).

Almost surely, 2^{78881443212101} is an apocalyptic number.

It is an amenable number.

78881443212101 is a deficient number, since it is larger than the sum of its proper divisors (1).

78881443212101 is an equidigital number, since it uses as much as digits as its factorization.

78881443212101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 688128, while the sum is 50.

The spelling of 78881443212101 in words is "seventy-eight trillion, eight hundred eighty-one billion, four hundred forty-three million, two hundred twelve thousand, one hundred one".