777716323225 has 12 divisors (see below), whose sum is σ = 964422501804. Its totient is φ = 622138051520.

The previous prime is 777716323183. The next prime is 777716323231. The reversal of 777716323225 is 522323617777.

It can be written as a sum of positive squares in 6 ways, for example, as 4294574089 + 773421749136 = 65533^2 + 879444^2 .

It is not a de Polignac number, because 777716323225 - 2¹¹ = 777716321177 is a prime.

It is a super-2 number, since 2×777716323225² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 417274 + ... + 1315123.

It is an arithmetic number, because the mean of its divisors is an integer number (80368541817).

Almost surely, 2^777716323225 is an apocalyptic number.

It is an amenable number.

777716323225 is a deficient number, since it is larger than the sum of its proper divisors (186706178579).

777716323225 is a wasteful number, since it uses less digits than its factorization.

777716323225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1750364 (or 1750359 counting only the distinct ones).

The product of its digits is 5186160, while the sum is 52.

The spelling of 777716323225 in words is "seven hundred seventy-seven billion, seven hundred sixteen million, three hundred twenty-three thousand, two hundred twenty-five".