27765000061 has 2 divisors, whose sum is σ = 27765000062. Its totient is φ = 27765000060.

The previous prime is 27765000037. The next prime is 27765000089. The reversal of 27765000061 is 16000056772.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25878835161 + 1886164900 = 160869^2 + 43430^2 .

It is a cyclic number.

It is not a de Polignac number, because 27765000061 - 2¹¹ = 27764998013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 27764999990 and 27765000026.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27765000001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13882500030 + 13882500031.

It is an arithmetic number, because the mean of its divisors is an integer number (13882500031).

Almost surely, 2^27765000061 is an apocalyptic number.

It is an amenable number.

27765000061 is a deficient number, since it is larger than the sum of its proper divisors (1).

27765000061 is an equidigital number, since it uses as much as digits as its factorization.

27765000061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17640, while the sum is 34.

The spelling of 27765000061 in words is "twenty-seven billion, seven hundred sixty-five million, sixty-one", and thus it is an aban number.