766662548557 has 2 divisors, whose sum is σ = 766662548558. Its totient is φ = 766662548556.

The previous prime is 766662548537. The next prime is 766662548599. The reversal of 766662548557 is 755845266667.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 434816272836 + 331846275721 = 659406^2 + 576061^2 .

It is a cyclic number.

It is not a de Polignac number, because 766662548557 - 2¹¹ = 766662546509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 766662548492 and 766662548501.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (766662548537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 383331274278 + 383331274279.

It is an arithmetic number, because the mean of its divisors is an integer number (383331274279).

Almost surely, 2^766662548557 is an apocalyptic number.

It is an amenable number.

766662548557 is a deficient number, since it is larger than the sum of its proper divisors (1).

766662548557 is an equidigital number, since it uses as much as digits as its factorization.

766662548557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 508032000, while the sum is 67.

The spelling of 766662548557 in words is "seven hundred sixty-six billion, six hundred sixty-two million, five hundred forty-eight thousand, five hundred fifty-seven".