27771623069 has 2 divisors, whose sum is σ = 27771623070. Its totient is φ = 27771623068.

The previous prime is 27771623051. The next prime is 27771623081. The reversal of 27771623069 is 96032617772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18471528100 + 9300094969 = 135910^2 + 96437^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27771623069 is a prime.

It is a super-2 number, since 2×27771623069² (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 (27771620069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13885811534 + 13885811535.

It is an arithmetic number, because the mean of its divisors is an integer number (13885811535).

Almost surely, 2^27771623069 is an apocalyptic number.

It is an amenable number.

27771623069 is a deficient number, since it is larger than the sum of its proper divisors (1).

27771623069 is an equidigital number, since it uses as much as digits as its factorization.

27771623069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1333584, while the sum is 50.

The spelling of 27771623069 in words is "twenty-seven billion, seven hundred seventy-one million, six hundred twenty-three thousand, sixty-nine".