78826045931 has 2 divisors, whose sum is σ = 78826045932. Its totient is φ = 78826045930.

The previous prime is 78826045919. The next prime is 78826045933. The reversal of 78826045931 is 13954062887.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78826045931 - 2³⁰ = 77752304107 is a prime.

It is a super-2 number, since 2×78826045931² (a number of 23 digits) contains 22 as substring.

Together with 78826045933, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78826045933) 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, 39413022965 + 39413022966.

It is an arithmetic number, because the mean of its divisors is an integer number (39413022966).

It is a 1-persistent number, because it is pandigital, but 2⋅78826045931 = 157652091862 is not.

Almost surely, 2^78826045931 is an apocalyptic number.

78826045931 is a deficient number, since it is larger than the sum of its proper divisors (1).

78826045931 is an equidigital number, since it uses as much as digits as its factorization.

78826045931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2903040, while the sum is 53.

The spelling of 78826045931 in words is "seventy-eight billion, eight hundred twenty-six million, forty-five thousand, nine hundred thirty-one".