78338863511 has 2 divisors, whose sum is σ = 78338863512. Its totient is φ = 78338863510.

The previous prime is 78338863483. The next prime is 78338863583. The reversal of 78338863511 is 11536883387.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78338863511 - 2¹⁰ = 78338862487 is a prime.

It is a super-2 number, since 2×78338863511² (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 (78338863111) 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, 39169431755 + 39169431756.

It is an arithmetic number, because the mean of its divisors is an integer number (39169431756).

Almost surely, 2^78338863511 is an apocalyptic number.

78338863511 is a deficient number, since it is larger than the sum of its proper divisors (1).

78338863511 is an equidigital number, since it uses as much as digits as its factorization.

78338863511 is an odious number, because the sum of its binary digits is odd.

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

The spelling of 78338863511 in words is "seventy-eight billion, three hundred thirty-eight million, eight hundred sixty-three thousand, five hundred eleven".