861766677 has 6 divisors (see below), whose sum is σ = 1244774102. Its totient is φ = 574511112.

The previous prime is 861766657. The next prime is 861766687. The reversal of 861766677 is 776667168.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 555026481 + 306740196 = 23559^2 + 17514^2 .

It is not a de Polignac number, because 861766677 - 2⁸ = 861766421 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 (861766657) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 47875918 + ... + 47875935.

Almost surely, 2^861766677 is an apocalyptic number.

It is an amenable number.

861766677 is a deficient number, since it is larger than the sum of its proper divisors (383007425).

861766677 is a wasteful number, since it uses less digits than its factorization.

861766677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95751859 (or 95751856 counting only the distinct ones).

The product of its digits is 3556224, while the sum is 54.

The square root of 861766677 is about 29355.8627364280. The cubic root of 861766677 is about 951.6192797280.

The spelling of 861766677 in words is "eight hundred sixty-one million, seven hundred sixty-six thousand, six hundred seventy-seven".