766665461 has 2 divisors, whose sum is σ = 766665462. Its totient is φ = 766665460.

The previous prime is 766665407. The next prime is 766665499. The reversal of 766665461 is 164566667.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 529690225 + 236975236 = 23015^2 + 15394^2 .

It is a cyclic number.

It is not a de Polignac number, because 766665461 - 2⁶ = 766665397 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (766665661) 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 as a sum of consecutive naturals, namely, 383332730 + 383332731.

It is an arithmetic number, because the mean of its divisors is an integer number (383332731).

Almost surely, 2^766665461 is an apocalyptic number.

It is an amenable number.

766665461 is a deficient number, since it is larger than the sum of its proper divisors (1).

766665461 is an equidigital number, since it uses as much as digits as its factorization.

766665461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1088640, while the sum is 47.

The square root of 766665461 is about 27688.7244379368. The cubic root of 766665461 is about 915.2406469867.

The spelling of 766665461 in words is "seven hundred sixty-six million, six hundred sixty-five thousand, four hundred sixty-one".