277489375489891 has 2 divisors, whose sum is σ = 277489375489892. Its totient is φ = 277489375489890.

The previous prime is 277489375489841. The next prime is 277489375489993. The reversal of 277489375489891 is 198984573984772.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 277489375489891 - 2¹¹ = 277489375487843 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 277489375489796 and 277489375489805.

It is not a weakly prime, because it can be changed into another prime (277489375489801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 138744687744945 + 138744687744946.

It is an arithmetic number, because the mean of its divisors is an integer number (138744687744946).

Almost surely, 2^{277489375489891} is an apocalyptic number.

277489375489891 is a deficient number, since it is larger than the sum of its proper divisors (1).

277489375489891 is an equidigital number, since it uses as much as digits as its factorization.

277489375489891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 61451550720, while the sum is 91.

The spelling of 277489375489891 in words is "two hundred seventy-seven trillion, four hundred eighty-nine billion, three hundred seventy-five million, four hundred eighty-nine thousand, eight hundred ninety-one".