78242237543 has 2 divisors, whose sum is σ = 78242237544. Its totient is φ = 78242237542.

The previous prime is 78242237533. The next prime is 78242237611. The reversal of 78242237543 is 34573224287.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78242237543 - 2³² = 73947270247 is a prime.

It is a super-2 number, since 2×78242237543² (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 (78242237533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39121118771 + 39121118772.

It is an arithmetic number, because the mean of its divisors is an integer number (39121118772).

Almost surely, 2^78242237543 is an apocalyptic number.

78242237543 is a deficient number, since it is larger than the sum of its proper divisors (1).

78242237543 is an equidigital number, since it uses as much as digits as its factorization.

78242237543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2257920, while the sum is 47.

The spelling of 78242237543 in words is "seventy-eight billion, two hundred forty-two million, two hundred thirty-seven thousand, five hundred forty-three".