278855265541 has 2 divisors, whose sum is σ = 278855265542. Its totient is φ = 278855265540.

The previous prime is 278855265527. The next prime is 278855265571. The reversal of 278855265541 is 145562558872.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 210914236516 + 67941029025 = 459254^2 + 260655^2 .

It is a cyclic number.

It is not a de Polignac number, because 278855265541 - 2⁷ = 278855265413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (278855265571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139427632770 + 139427632771.

It is an arithmetic number, because the mean of its divisors is an integer number (139427632771).

Almost surely, 2^278855265541 is an apocalyptic number.

It is an amenable number.

278855265541 is a deficient number, since it is larger than the sum of its proper divisors (1).

278855265541 is an equidigital number, since it uses as much as digits as its factorization.

278855265541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26880000, while the sum is 58.

The spelling of 278855265541 in words is "two hundred seventy-eight billion, eight hundred fifty-five million, two hundred sixty-five thousand, five hundred forty-one".