766223740649 has 2 divisors, whose sum is σ = 766223740650. Its totient is φ = 766223740648.

The previous prime is 766223740619. The next prime is 766223740721. The reversal of 766223740649 is 946047322667.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 719219332624 + 47004408025 = 848068^2 + 216805^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-766223740649 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 766223740594 and 766223740603.

It is not a weakly prime, because it can be changed into another prime (766223740609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 383111870324 + 383111870325.

It is an arithmetic number, because the mean of its divisors is an integer number (383111870325).

Almost surely, 2^766223740649 is an apocalyptic number.

It is an amenable number.

766223740649 is a deficient number, since it is larger than the sum of its proper divisors (1).

766223740649 is an equidigital number, since it uses as much as digits as its factorization.

766223740649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18289152, while the sum is 56.

The spelling of 766223740649 in words is "seven hundred sixty-six billion, two hundred twenty-three million, seven hundred forty thousand, six hundred forty-nine".