279778698377 has 2 divisors, whose sum is σ = 279778698378. Its totient is φ = 279778698376.

The previous prime is 279778698319. The next prime is 279778698401. The reversal of 279778698377 is 773896877972.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 255814419961 + 23964278416 = 505781^2 + 154804^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-279778698377 is a prime.

It is a super-2 number, since 2×279778698377² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (279778698677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139889349188 + 139889349189.

It is an arithmetic number, because the mean of its divisors is an integer number (139889349189).

Almost surely, 2^279778698377 is an apocalyptic number.

It is an amenable number.

279778698377 is a deficient number, since it is larger than the sum of its proper divisors (1).

279778698377 is an equidigital number, since it uses as much as digits as its factorization.

279778698377 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3136589568, while the sum is 80.

The spelling of 279778698377 in words is "two hundred seventy-nine billion, seven hundred seventy-eight million, six hundred ninety-eight thousand, three hundred seventy-seven".