78880854457 has 2 divisors, whose sum is σ = 78880854458. Its totient is φ = 78880854456.

The previous prime is 78880854433. The next prime is 78880854463. The reversal of 78880854457 is 75445808887.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78873352336 + 7502121 = 280844^2 + 2739^2 .

It is a cyclic number.

It is not a de Polignac number, because 78880854457 - 2³¹ = 76733370809 is a prime.

It is not a weakly prime, because it can be changed into another prime (78880854407) 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, 39440427228 + 39440427229.

It is an arithmetic number, because the mean of its divisors is an integer number (39440427229).

Almost surely, 2^78880854457 is an apocalyptic number.

It is an amenable number.

78880854457 is a deficient number, since it is larger than the sum of its proper divisors (1).

78880854457 is an equidigital number, since it uses as much as digits as its factorization.

78880854457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80281600, while the sum is 64.

The spelling of 78880854457 in words is "seventy-eight billion, eight hundred eighty million, eight hundred fifty-four thousand, four hundred fifty-seven".