278767667641 has 2 divisors, whose sum is σ = 278767667642. Its totient is φ = 278767667640.

The previous prime is 278767667627. The next prime is 278767667669. The reversal of 278767667641 is 146766767872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 278595008041 + 172659600 = 527821^2 + 13140^2 .

It is a cyclic number.

It is not a de Polignac number, because 278767667641 - 2¹³ = 278767659449 is a prime.

It is a super-2 number, since 2×278767667641² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (278767667611) 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, 139383833820 + 139383833821.

It is an arithmetic number, because the mean of its divisors is an integer number (139383833821).

Almost surely, 2^278767667641 is an apocalyptic number.

It is an amenable number.

278767667641 is a deficient number, since it is larger than the sum of its proper divisors (1).

278767667641 is an equidigital number, since it uses as much as digits as its factorization.

278767667641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 199148544, while the sum is 67.

The spelling of 278767667641 in words is "two hundred seventy-eight billion, seven hundred sixty-seven million, six hundred sixty-seven thousand, six hundred forty-one".