280255277777 has 2 divisors, whose sum is σ = 280255277778. Its totient is φ = 280255277776.

The previous prime is 280255277749. The next prime is 280255277791. The reversal of 280255277777 is 777772552082.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 182601527761 + 97653750016 = 427319^2 + 312496^2 .

It is a cyclic number.

It is not a de Polignac number, because 280255277777 - 2²⁸ = 279986842321 is a prime.

It is not a weakly prime, because it can be changed into another prime (280255277077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140127638888 + 140127638889.

It is an arithmetic number, because the mean of its divisors is an integer number (140127638889).

Almost surely, 2^280255277777 is an apocalyptic number.

It is an amenable number.

280255277777 is a deficient number, since it is larger than the sum of its proper divisors (1).

280255277777 is an equidigital number, since it uses as much as digits as its factorization.

280255277777 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26891200, while the sum is 59.

The spelling of 280255277777 in words is "two hundred eighty billion, two hundred fifty-five million, two hundred seventy-seven thousand, seven hundred seventy-seven".