78311888833 has 2 divisors, whose sum is σ = 78311888834. Its totient is φ = 78311888832.

The previous prime is 78311888827. The next prime is 78311888861. The reversal of 78311888833 is 33888811387.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73320183729 + 4991705104 = 270777^2 + 70652^2 .

It is a cyclic number.

It is not a de Polignac number, because 78311888833 - 2⁵ = 78311888801 is a prime.

It is a super-2 number, since 2×78311888833² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78311889833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39155944416 + 39155944417.

It is an arithmetic number, because the mean of its divisors is an integer number (39155944417).

Almost surely, 2^78311888833 is an apocalyptic number.

It is an amenable number.

78311888833 is a deficient number, since it is larger than the sum of its proper divisors (1).

78311888833 is an equidigital number, since it uses as much as digits as its factorization.

78311888833 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6193152, while the sum is 58.

The spelling of 78311888833 in words is "seventy-eight billion, three hundred eleven million, eight hundred eighty-eight thousand, eight hundred thirty-three".