773663661 has 6 divisors (see below), whose sum is σ = 1117514190. Its totient is φ = 515775768.

The previous prime is 773663651. The next prime is 773663677. The reversal of 773663661 is 166366377.

773663661 is a `hidden beast` number, since 7 + 7 + 3 + 6 + 636 + 6 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 657153225 + 116510436 = 25635^2 + 10794^2 .

It is not a de Polignac number, because 773663661 - 2²⁹ = 236792749 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (773663651) 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 5 ways as a sum of consecutive naturals, for example, 42981306 + ... + 42981323.

It is an arithmetic number, because the mean of its divisors is an integer number (186252365).

Almost surely, 2^773663661 is an apocalyptic number.

It is an amenable number.

773663661 is a deficient number, since it is larger than the sum of its proper divisors (343850529).

773663661 is a wasteful number, since it uses less digits than its factorization.

773663661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85962635 (or 85962632 counting only the distinct ones).

The product of its digits is 571536, while the sum is 45.

The square root of 773663661 is about 27814.8101018145. The cubic root of 773663661 is about 918.0170194917.

The spelling of 773663661 in words is "seven hundred seventy-three million, six hundred sixty-three thousand, six hundred sixty-one".