77611643 has 2 divisors, whose sum is σ = 77611644. Its totient is φ = 77611642.

The previous prime is 77611621. The next prime is 77611657. The reversal of 77611643 is 34611677.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77611643 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (77611673) 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, 38805821 + 38805822.

It is an arithmetic number, because the mean of its divisors is an integer number (38805822).

Almost surely, 2^77611643 is an apocalyptic number.

77611643 is a deficient number, since it is larger than the sum of its proper divisors (1).

77611643 is an equidigital number, since it uses as much as digits as its factorization.

77611643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21168, while the sum is 35.

The square root of 77611643 is about 8809.7470451767. The cubic root of 77611643 is about 426.5555782433. Note that the first 4 decimals are identical.

The spelling of 77611643 in words is "seventy-seven million, six hundred eleven thousand, six hundred forty-three".