78960438077 has 2 divisors, whose sum is σ = 78960438078. Its totient is φ = 78960438076.

The previous prime is 78960438061. The next prime is 78960438119. The reversal of 78960438077 is 77083406987.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69896255641 + 9064182436 = 264379^2 + 95206^2 .

It is an emirp because it is prime and its reverse (77083406987) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78960438077 - 2⁴ = 78960438061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78960438017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39480219038 + 39480219039.

It is an arithmetic number, because the mean of its divisors is an integer number (39480219039).

Almost surely, 2^78960438077 is an apocalyptic number.

It is an amenable number.

78960438077 is a deficient number, since it is larger than the sum of its proper divisors (1).

78960438077 is an equidigital number, since it uses as much as digits as its factorization.

78960438077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14224896, while the sum is 59.

The spelling of 78960438077 in words is "seventy-eight billion, nine hundred sixty million, four hundred thirty-eight thousand, seventy-seven".