766705637 has 2 divisors, whose sum is σ = 766705638. Its totient is φ = 766705636.

The previous prime is 766705633. The next prime is 766705669. The reversal of 766705637 is 736507667.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 390694756 + 376010881 = 19766^2 + 19391^2 .

It is a cyclic number.

It is not a de Polignac number, because 766705637 - 2² = 766705633 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 766705591 and 766705600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (766705633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 383352818 + 383352819.

It is an arithmetic number, because the mean of its divisors is an integer number (383352819).

Almost surely, 2^766705637 is an apocalyptic number.

It is an amenable number.

766705637 is a deficient number, since it is larger than the sum of its proper divisors (1).

766705637 is an equidigital number, since it uses as much as digits as its factorization.

766705637 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1111320, while the sum is 47.

The square root of 766705637 is about 27689.4499223080. The cubic root of 766705637 is about 915.2566339971.

The spelling of 766705637 in words is "seven hundred sixty-six million, seven hundred five thousand, six hundred thirty-seven".