278461490669 has 2 divisors, whose sum is σ = 278461490670. Its totient is φ = 278461490668.

The previous prime is 278461490653. The next prime is 278461490683. The reversal of 278461490669 is 966094164872.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 275740512100 + 2720978569 = 525110^2 + 52163^2 .

It is a cyclic number.

It is not a de Polignac number, because 278461490669 - 2⁴ = 278461490653 is a prime.

It is a super-2 number, since 2×278461490669² (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 (278461490639) 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, 139230745334 + 139230745335.

It is an arithmetic number, because the mean of its divisors is an integer number (139230745335).

Almost surely, 2^278461490669 is an apocalyptic number.

It is an amenable number.

278461490669 is a deficient number, since it is larger than the sum of its proper divisors (1).

278461490669 is an equidigital number, since it uses as much as digits as its factorization.

278461490669 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31352832, while the sum is 62.

The spelling of 278461490669 in words is "two hundred seventy-eight billion, four hundred sixty-one million, four hundred ninety thousand, six hundred sixty-nine".