278504553601 has 2 divisors, whose sum is σ = 278504553602. Its totient is φ = 278504553600.

The previous prime is 278504553599. The next prime is 278504553611. The reversal of 278504553601 is 106355405872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 156815208001 + 121689345600 = 395999^2 + 348840^2 .

It is a cyclic number.

It is not a de Polignac number, because 278504553601 - 2¹ = 278504553599 is a prime.

Together with 278504553599, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (278504553611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139252276800 + 139252276801.

It is an arithmetic number, because the mean of its divisors is an integer number (139252276801).

Almost surely, 2^278504553601 is an apocalyptic number.

It is an amenable number.

278504553601 is a deficient number, since it is larger than the sum of its proper divisors (1).

278504553601 is an equidigital number, since it uses as much as digits as its factorization.

278504553601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008000, while the sum is 46.

The spelling of 278504553601 in words is "two hundred seventy-eight billion, five hundred four million, five hundred fifty-three thousand, six hundred one".