77661611 has 2 divisors, whose sum is σ = 77661612. Its totient is φ = 77661610.

The previous prime is 77661539. The next prime is 77661629. The reversal of 77661611 is 11616677.

It is a strong prime.

It is an emirp because it is prime and its reverse (11616677) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77661611 - 2²² = 73467307 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (77661511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38830805 + 38830806.

It is an arithmetic number, because the mean of its divisors is an integer number (38830806).

Almost surely, 2^77661611 is an apocalyptic number.

77661611 is a deficient number, since it is larger than the sum of its proper divisors (1).

77661611 is an equidigital number, since it uses as much as digits as its factorization.

77661611 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10584, while the sum is 35.

The square root of 77661611 is about 8812.5825386206. The cubic root of 77661611 is about 426.6471004075.

The spelling of 77661611 in words is "seventy-seven million, six hundred sixty-one thousand, six hundred eleven".