277920345257 has 2 divisors, whose sum is σ = 277920345258. Its totient is φ = 277920345256.

The previous prime is 277920345253. The next prime is 277920345281. The reversal of 277920345257 is 752543029772.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 192992397481 + 84927947776 = 439309^2 + 291424^2 .

It is a cyclic number.

It is not a de Polignac number, because 277920345257 - 2² = 277920345253 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 277920345199 and 277920345208.

It is not a weakly prime, because it can be changed into another prime (277920345253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 138960172628 + 138960172629.

It is an arithmetic number, because the mean of its divisors is an integer number (138960172629).

Almost surely, 2^277920345257 is an apocalyptic number.

It is an amenable number.

277920345257 is a deficient number, since it is larger than the sum of its proper divisors (1).

277920345257 is an equidigital number, since it uses as much as digits as its factorization.

277920345257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7408800, while the sum is 53.

The spelling of 277920345257 in words is "two hundred seventy-seven billion, nine hundred twenty million, three hundred forty-five thousand, two hundred fifty-seven".