78330057881 has 2 divisors, whose sum is σ = 78330057882. Its totient is φ = 78330057880.

The previous prime is 78330057811. The next prime is 78330057929. The reversal of 78330057881 is 18875003387.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47277979225 + 31052078656 = 217435^2 + 176216^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78330057881 is a prime.

It is a super-2 number, since 2×78330057881² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78330057811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39165028940 + 39165028941.

It is an arithmetic number, because the mean of its divisors is an integer number (39165028941).

Almost surely, 2^78330057881 is an apocalyptic number.

It is an amenable number.

78330057881 is a deficient number, since it is larger than the sum of its proper divisors (1).

78330057881 is an equidigital number, since it uses as much as digits as its factorization.

78330057881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1128960, while the sum is 50.

The spelling of 78330057881 in words is "seventy-eight billion, three hundred thirty million, fifty-seven thousand, eight hundred eighty-one".