27213778877 has 2 divisors, whose sum is σ = 27213778878. Its totient is φ = 27213778876.

The previous prime is 27213778873. The next prime is 27213778883. The reversal of 27213778877 is 77887731272.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25775018116 + 1438760761 = 160546^2 + 37931^2 .

It is a cyclic number.

It is not a de Polignac number, because 27213778877 - 2² = 27213778873 is a prime.

It is a super-2 number, since 2×27213778877² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27213778873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13606889438 + 13606889439.

It is an arithmetic number, because the mean of its divisors is an integer number (13606889439).

Almost surely, 2^27213778877 is an apocalyptic number.

It is an amenable number.

27213778877 is a deficient number, since it is larger than the sum of its proper divisors (1).

27213778877 is an equidigital number, since it uses as much as digits as its factorization.

27213778877 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12907776, while the sum is 59.

The spelling of 27213778877 in words is "twenty-seven billion, two hundred thirteen million, seven hundred seventy-eight thousand, eight hundred seventy-seven".