78183635531 has 2 divisors, whose sum is σ = 78183635532. Its totient is φ = 78183635530.

The previous prime is 78183635513. The next prime is 78183635587. The reversal of 78183635531 is 13553638187.

Together with previous prime (78183635513) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is an emirp because it is prime and its reverse (13553638187) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78183635531 - 2³⁴ = 61003766347 is a prime.

It is a super-2 number, since 2×78183635531² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78183635531.

It is not a weakly prime, because it can be changed into another prime (78183637531) 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, 39091817765 + 39091817766.

It is an arithmetic number, because the mean of its divisors is an integer number (39091817766).

Almost surely, 2^78183635531 is an apocalyptic number.

78183635531 is a deficient number, since it is larger than the sum of its proper divisors (1).

78183635531 is an equidigital number, since it uses as much as digits as its factorization.

78183635531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1814400, while the sum is 50.

The spelling of 78183635531 in words is "seventy-eight billion, one hundred eighty-three million, six hundred thirty-five thousand, five hundred thirty-one".