278500000061 has 2 divisors, whose sum is σ = 278500000062. Its totient is φ = 278500000060.

The previous prime is 278500000049. The next prime is 278500000169. The reversal of 278500000061 is 160000005872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 159384592900 + 119115407161 = 399230^2 + 345131^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-278500000061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (278500000661) 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, 139250000030 + 139250000031.

It is an arithmetic number, because the mean of its divisors is an integer number (139250000031).

Almost surely, 2^278500000061 is an apocalyptic number.

It is an amenable number.

278500000061 is a deficient number, since it is larger than the sum of its proper divisors (1).

278500000061 is an equidigital number, since it uses as much as digits as its factorization.

278500000061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3360, while the sum is 29.

The spelling of 278500000061 in words is "two hundred seventy-eight billion, five hundred million, sixty-one", and thus it is an aban number.