78102304781 has 2 divisors, whose sum is σ = 78102304782. Its totient is φ = 78102304780.

The previous prime is 78102304771. The next prime is 78102304789. The reversal of 78102304781 is 18740320187.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46893902500 + 31208402281 = 216550^2 + 176659^2 .

It is a cyclic number.

It is not a de Polignac number, because 78102304781 - 2³⁴ = 60922435597 is a prime.

It is a super-2 number, since 2×78102304781² (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 (78102304789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39051152390 + 39051152391.

It is an arithmetic number, because the mean of its divisors is an integer number (39051152391).

Almost surely, 2^78102304781 is an apocalyptic number.

It is an amenable number.

78102304781 is a deficient number, since it is larger than the sum of its proper divisors (1).

78102304781 is an equidigital number, since it uses as much as digits as its factorization.

78102304781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 75264, while the sum is 41.

The spelling of 78102304781 in words is "seventy-eight billion, one hundred two million, three hundred four thousand, seven hundred eighty-one".