78471775168441 has 2 divisors, whose sum is σ = 78471775168442. Its totient is φ = 78471775168440.

The previous prime is 78471775168427. The next prime is 78471775168453. The reversal of 78471775168441 is 14486157717487.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74698060982416 + 3773714186025 = 8642804^2 + 1942605^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78471775168441 is a prime.

It is not a weakly prime, because it can be changed into another prime (78471775168411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39235887584220 + 39235887584221.

It is an arithmetic number, because the mean of its divisors is an integer number (39235887584221).

Almost surely, 2^{78471775168441} is an apocalyptic number.

It is an amenable number.

78471775168441 is a deficient number, since it is larger than the sum of its proper divisors (1).

78471775168441 is an equidigital number, since it uses as much as digits as its factorization.

78471775168441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 295034880, while the sum is 70.

The spelling of 78471775168441 in words is "seventy-eight trillion, four hundred seventy-one billion, seven hundred seventy-five million, one hundred sixty-eight thousand, four hundred forty-one".