278648553797 has 2 divisors, whose sum is σ = 278648553798. Its totient is φ = 278648553796.

The previous prime is 278648553773. The next prime is 278648553823. The reversal of 278648553797 is 797355846872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 278276295361 + 372258436 = 527519^2 + 19294^2 .

It is a cyclic number.

It is not a de Polignac number, because 278648553797 - 2⁸ = 278648553541 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 278648553797.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (278648553497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139324276898 + 139324276899.

It is an arithmetic number, because the mean of its divisors is an integer number (139324276899).

Almost surely, 2^278648553797 is an apocalyptic number.

It is an amenable number.

278648553797 is a deficient number, since it is larger than the sum of its proper divisors (1).

278648553797 is an equidigital number, since it uses as much as digits as its factorization.

278648553797 is an evil number, because the sum of its binary digits is even.

The product of its digits is 711244800, while the sum is 71.

The spelling of 278648553797 in words is "two hundred seventy-eight billion, six hundred forty-eight million, five hundred fifty-three thousand, seven hundred ninety-seven".