775002661 has 2 divisors, whose sum is σ = 775002662. Its totient is φ = 775002660.

The previous prime is 775002659. The next prime is 775002673. The reversal of 775002661 is 166200577.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 412861761 + 362140900 = 20319^2 + 19030^2 .

It is a cyclic number.

It is not a de Polignac number, because 775002661 - 2¹ = 775002659 is a prime.

Together with 775002659, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (775002691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 387501330 + 387501331.

It is an arithmetic number, because the mean of its divisors is an integer number (387501331).

Almost surely, 2^775002661 is an apocalyptic number.

It is an amenable number.

775002661 is a deficient number, since it is larger than the sum of its proper divisors (1).

775002661 is an equidigital number, since it uses as much as digits as its factorization.

775002661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17640, while the sum is 34.

The square root of 775002661 is about 27838.8696070800. The cubic root of 775002661 is about 918.5463262958.

The spelling of 775002661 in words is "seven hundred seventy-five million, two thousand, six hundred sixty-one".