27661630837 has 2 divisors, whose sum is σ = 27661630838. Its totient is φ = 27661630836.

The previous prime is 27661630819. The next prime is 27661630873. The reversal of 27661630837 is 73803616672.

It is a happy number.

Together with next prime (27661630873) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21623408401 + 6038222436 = 147049^2 + 77706^2 .

It is a cyclic number.

It is not a de Polignac number, because 27661630837 - 2¹¹ = 27661628789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27661630817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13830815418 + 13830815419.

It is an arithmetic number, because the mean of its divisors is an integer number (13830815419).

Almost surely, 2^27661630837 is an apocalyptic number.

It is an amenable number.

27661630837 is a deficient number, since it is larger than the sum of its proper divisors (1).

27661630837 is an equidigital number, since it uses as much as digits as its factorization.

27661630837 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1524096, while the sum is 49.

The spelling of 27661630837 in words is "twenty-seven billion, six hundred sixty-one million, six hundred thirty thousand, eight hundred thirty-seven".