278038777543 has 2 divisors, whose sum is σ = 278038777544. Its totient is φ = 278038777542.

The previous prime is 278038777529. The next prime is 278038777589. The reversal of 278038777543 is 345777830872.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 278038777543 - 2²¹ = 278036680391 is a prime.

It is a super-2 number, since 2×278038777543² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (278038777843) 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, 139019388771 + 139019388772.

It is an arithmetic number, because the mean of its divisors is an integer number (139019388772).

Almost surely, 2^278038777543 is an apocalyptic number.

278038777543 is a deficient number, since it is larger than the sum of its proper divisors (1).

278038777543 is an equidigital number, since it uses as much as digits as its factorization.

278038777543 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 55319040, while the sum is 61.

The spelling of 278038777543 in words is "two hundred seventy-eight billion, thirty-eight million, seven hundred seventy-seven thousand, five hundred forty-three".