279845355359261 has 2 divisors, whose sum is σ = 279845355359262. Its totient is φ = 279845355359260.

The previous prime is 279845355359191. The next prime is 279845355359267. The reversal of 279845355359261 is 162953553548972.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 176831990156761 + 103013365202500 = 13297819^2 + 10149550^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-279845355359261 is a prime.

It is a super-2 number, since 2×279845355359261² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (279845355359267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139922677679630 + 139922677679631.

It is an arithmetic number, because the mean of its divisors is an integer number (139922677679631).

Almost surely, 2^{279845355359261} is an apocalyptic number.

It is an amenable number.

279845355359261 is a deficient number, since it is larger than the sum of its proper divisors (1).

279845355359261 is an equidigital number, since it uses as much as digits as its factorization.

279845355359261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2449440000, while the sum is 74.

The spelling of 279845355359261 in words is "two hundred seventy-nine trillion, eight hundred forty-five billion, three hundred fifty-five million, three hundred fifty-nine thousand, two hundred sixty-one".