777222085 has 4 divisors (see below), whose sum is σ = 932666508. Its totient is φ = 621777664.

The previous prime is 777222077. The next prime is 777222091. The reversal of 777222085 is 580222777.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 580222777 = 11119 ⋅52183.

It can be written as a sum of positive squares in 2 ways, for example, as 575184289 + 202037796 = 23983^2 + 14214^2 .

It is a cyclic number.

It is not a de Polignac number, because 777222085 - 2³ = 777222077 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77722204 + ... + 77722213.

It is an arithmetic number, because the mean of its divisors is an integer number (233166627).

Almost surely, 2^777222085 is an apocalyptic number.

It is an amenable number.

777222085 is a deficient number, since it is larger than the sum of its proper divisors (155444423).

777222085 is a wasteful number, since it uses less digits than its factorization.

777222085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155444422.

The product of its (nonzero) digits is 109760, while the sum is 40.

The square root of 777222085 is about 27878.7030724171. The cubic root of 777222085 is about 919.4223236268.

The spelling of 777222085 in words is "seven hundred seventy-seven million, two hundred twenty-two thousand, eighty-five".