77828223365 has 4 divisors (see below), whose sum is σ = 93393868044. Its totient is φ = 62262578688.

The previous prime is 77828223359. The next prime is 77828223367. The reversal of 77828223365 is 56332282877.

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 27169917889 + 50658305476 = 164833^2 + 225074^2 .

It is a cyclic number.

It is not a de Polignac number, because 77828223365 - 2⁴ = 77828223349 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 (77828223367) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7782822332 + ... + 7782822341.

It is an arithmetic number, because the mean of its divisors is an integer number (23348467011).

Almost surely, 2^77828223365 is an apocalyptic number.

It is an amenable number.

77828223365 is a deficient number, since it is larger than the sum of its proper divisors (15565644679).

77828223365 is a wasteful number, since it uses less digits than its factorization.

77828223365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15565644678.

The product of its digits is 6773760, while the sum is 53.

The spelling of 77828223365 in words is "seventy-seven billion, eight hundred twenty-eight million, two hundred twenty-three thousand, three hundred sixty-five".