27765765997 has 2 divisors, whose sum is σ = 27765765998. Its totient is φ = 27765765996.

The previous prime is 27765765953. The next prime is 27765766121. The reversal of 27765765997 is 79956756772.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17528171236 + 10237594761 = 132394^2 + 101181^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27765765997 is a prime.

It is a super-2 number, since 2×27765765997² (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 (27765765917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13882882998 + 13882882999.

It is an arithmetic number, because the mean of its divisors is an integer number (13882882999).

Almost surely, 2^27765765997 is an apocalyptic number.

It is an amenable number.

27765765997 is a deficient number, since it is larger than the sum of its proper divisors (1).

27765765997 is an equidigital number, since it uses as much as digits as its factorization.

27765765997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 350065800, while the sum is 70.

The spelling of 27765765997 in words is "twenty-seven billion, seven hundred sixty-five million, seven hundred sixty-five thousand, nine hundred ninety-seven".