77655493 has 2 divisors, whose sum is σ = 77655494. Its totient is φ = 77655492.

The previous prime is 77655491. The next prime is 77655551. The reversal of 77655493 is 39455677.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50438404 + 27217089 = 7102^2 + 5217^2 .

It is an emirp because it is prime and its reverse (39455677) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77655493 - 2¹ = 77655491 is a prime.

Together with 77655491, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77655491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38827746 + 38827747.

It is an arithmetic number, because the mean of its divisors is an integer number (38827747).

Almost surely, 2^77655493 is an apocalyptic number.

It is an amenable number.

77655493 is a deficient number, since it is larger than the sum of its proper divisors (1).

77655493 is an equidigital number, since it uses as much as digits as its factorization.

77655493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 793800, while the sum is 46.

The square root of 77655493 is about 8812.2354144678. The cubic root of 77655493 is about 426.6358966932.

The spelling of 77655493 in words is "seventy-seven million, six hundred fifty-five thousand, four hundred ninety-three".