278535782461 has 2 divisors, whose sum is σ = 278535782462. Its totient is φ = 278535782460.

The previous prime is 278535782401. The next prime is 278535782467. The reversal of 278535782461 is 164287535872.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 254268062500 + 24267719961 = 504250^2 + 155781^2 .

It is a cyclic number.

It is not a de Polignac number, because 278535782461 - 2⁷ = 278535782333 is a prime.

It is a super-2 number, since 2×278535782461² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 278535782396 and 278535782405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (278535782467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139267891230 + 139267891231.

It is an arithmetic number, because the mean of its divisors is an integer number (139267891231).

Almost surely, 2^278535782461 is an apocalyptic number.

It is an amenable number.

278535782461 is a deficient number, since it is larger than the sum of its proper divisors (1).

278535782461 is an equidigital number, since it uses as much as digits as its factorization.

278535782461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22579200, while the sum is 58.

The spelling of 278535782461 in words is "two hundred seventy-eight billion, five hundred thirty-five million, seven hundred eighty-two thousand, four hundred sixty-one".