27644331497 has 2 divisors, whose sum is σ = 27644331498. Its totient is φ = 27644331496.

The previous prime is 27644331487. The next prime is 27644331503. The reversal of 27644331497 is 79413344672.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14082331561 + 13561999936 = 118669^2 + 116456^2 .

It is a cyclic number.

It is not a de Polignac number, because 27644331497 - 2⁶ = 27644331433 is a prime.

It is a super-2 number, since 2×27644331497² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (27644331487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13822165748 + 13822165749.

It is an arithmetic number, because the mean of its divisors is an integer number (13822165749).

Almost surely, 2^27644331497 is an apocalyptic number.

It is an amenable number.

27644331497 is a deficient number, since it is larger than the sum of its proper divisors (1).

27644331497 is an equidigital number, since it uses as much as digits as its factorization.

27644331497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3048192, while the sum is 50.

The spelling of 27644331497 in words is "twenty-seven billion, six hundred forty-four million, three hundred thirty-one thousand, four hundred ninety-seven".