77065565 has 4 divisors (see below), whose sum is σ = 92478684. Its totient is φ = 61652448.

The previous prime is 77065559. The next prime is 77065567. The reversal of 77065565 is 56556077.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21548164 + 55517401 = 4642^2 + 7451^2 .

It is a cyclic number.

It is not a de Polignac number, because 77065565 - 2⁸ = 77065309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77065567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7706552 + ... + 7706561.

It is an arithmetic number, because the mean of its divisors is an integer number (23119671).

Almost surely, 2^77065565 is an apocalyptic number.

It is an amenable number.

77065565 is a deficient number, since it is larger than the sum of its proper divisors (15413119).

77065565 is a wasteful number, since it uses less digits than its factorization.

77065565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15413118.

The product of its (nonzero) digits is 220500, while the sum is 41.

The square root of 77065565 is about 8778.6995050520. The cubic root of 77065565 is about 425.5528031412.

The spelling of 77065565 in words is "seventy-seven million, sixty-five thousand, five hundred sixty-five".