27780440969 has 2 divisors, whose sum is σ = 27780440970. Its totient is φ = 27780440968.

The previous prime is 27780440959. The next prime is 27780440983. The reversal of 27780440969 is 96904408772.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26965909369 + 814531600 = 164213^2 + 28540^2 .

It is a cyclic number.

It is not a de Polignac number, because 27780440969 - 2⁴ = 27780440953 is a prime.

It is a super-2 number, since 2×27780440969² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (27780440959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13890220484 + 13890220485.

It is an arithmetic number, because the mean of its divisors is an integer number (13890220485).

Almost surely, 2^27780440969 is an apocalyptic number.

It is an amenable number.

27780440969 is a deficient number, since it is larger than the sum of its proper divisors (1).

27780440969 is an equidigital number, since it uses as much as digits as its factorization.

27780440969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6096384, while the sum is 56.

The spelling of 27780440969 in words is "twenty-seven billion, seven hundred eighty million, four hundred forty thousand, nine hundred sixty-nine".