78848558981 has 2 divisors, whose sum is σ = 78848558982. Its totient is φ = 78848558980.

The previous prime is 78848558969. The next prime is 78848559001. The reversal of 78848558981 is 18985584887.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60587361025 + 18261197956 = 246145^2 + 135134^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78848558981 is a prime.

It is a super-2 number, since 2×78848558981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78848558681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39424279490 + 39424279491.

It is an arithmetic number, because the mean of its divisors is an integer number (39424279491).

Almost surely, 2^78848558981 is an apocalyptic number.

It is an amenable number.

78848558981 is a deficient number, since it is larger than the sum of its proper divisors (1).

78848558981 is an equidigital number, since it uses as much as digits as its factorization.

78848558981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 206438400, while the sum is 71.

The spelling of 78848558981 in words is "seventy-eight billion, eight hundred forty-eight million, five hundred fifty-eight thousand, nine hundred eighty-one".